From ed900311d6fe229a50226ae2b3315fcccbec98ac Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Wed, 7 Jul 2021 20:16:18 +0300
Subject: [PATCH 01/20] Homework 1 is done

---
 src/main/java/homework_1/Main.java | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/main/java/homework_1/Main.java b/src/main/java/homework_1/Main.java
index 07c029a2..911c9d57 100644
--- a/src/main/java/homework_1/Main.java
+++ b/src/main/java/homework_1/Main.java
@@ -3,7 +3,17 @@
 public class Main {
 
   public static void main(String[] args) {
-    System.out.println("Hello homework!");
+
+    for (String arg : args) {
+      if (arg.equals("error")) {
+        System.out.println("\u001B[41m" + "Alarm!" + "\u001B[0m");
+        break;
+      }
+      if (arg.length() != 8) {
+        continue;
+      }
+      System.out.println(arg);
+    }
   }
 
 }

From ffc5bc7878caaa674bcb7752eb5a775d59bde38d Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Thu, 8 Jul 2021 21:25:26 +0300
Subject: [PATCH 02/20] Homework 1 is done. Rework print to console.

---
 src/main/java/homework_1/Main.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/homework_1/Main.java b/src/main/java/homework_1/Main.java
index 911c9d57..5c049954 100644
--- a/src/main/java/homework_1/Main.java
+++ b/src/main/java/homework_1/Main.java
@@ -12,7 +12,7 @@ public static void main(String[] args) {
       if (arg.length() != 8) {
         continue;
       }
-      System.out.println(arg);
+      System.out.println(arg + ": " + arg.length());
     }
   }
 

From 5fc4b6623eb45d3292aeb7e05df89cfba4653571 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Thu, 8 Jul 2021 21:31:58 +0300
Subject: [PATCH 03/20] Made README.md correct style.

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 5d686e9f..ee527ea5 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,6 @@
 
 | Number | Solution  | Short description
 | --- | --- | --- |
-| HW1 | [Console printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/master/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
+| HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)

From f48b06eb92b03901a5a4a1780b9b4e0273aaa749 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Sun, 11 Jul 2021 12:39:25 +0300
Subject: [PATCH 04/20] Deleted if condition

---
 src/main/java/homework_1/Main.java | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/main/java/homework_1/Main.java b/src/main/java/homework_1/Main.java
index 5c049954..d58ee5ed 100644
--- a/src/main/java/homework_1/Main.java
+++ b/src/main/java/homework_1/Main.java
@@ -9,10 +9,7 @@ public static void main(String[] args) {
         System.out.println("\u001B[41m" + "Alarm!" + "\u001B[0m");
         break;
       }
-      if (arg.length() != 8) {
-        continue;
-      }
-      System.out.println(arg + ": " + arg.length());
+      System.out.println(arg + ": " + arg.length() + "letters");
     }
   }
 

From 9d17d8436145ef79bd8baafd37d8a4e77b69f08c Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Tue, 13 Jul 2021 20:19:51 +0300
Subject: [PATCH 05/20] Fixed style

---
 src/main/java/homework_1/Main.java | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/main/java/homework_1/Main.java b/src/main/java/homework_1/Main.java
index d58ee5ed..a44f167b 100644
--- a/src/main/java/homework_1/Main.java
+++ b/src/main/java/homework_1/Main.java
@@ -3,14 +3,13 @@
 public class Main {
 
   public static void main(String[] args) {
-
     for (String arg : args) {
       if (arg.equals("error")) {
         System.out.println("\u001B[41m" + "Alarm!" + "\u001B[0m");
         break;
       }
-      System.out.println(arg + ": " + arg.length() + "letters");
+
+      System.out.println(arg + " : " + arg.length() + " letters");
     }
   }
-
 }

From d8ea7632a27250b5c68ab4dd9b25955289e832c0 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Tue, 20 Jul 2021 01:16:26 +0300
Subject: [PATCH 06/20] Completed the homework3

---
 .../java/homework_2/pyramidprinter/Main.java  |  9 ++++
 .../pyramidprinter/PyramidPrinter.java        | 28 +++++++++++
 .../homework_2/randomcharstable/Main.java     | 10 ++++
 .../randomcharstable/RandomCharsTable.java    | 49 +++++++++++++++++++
 .../java/homework_2/trafficlight/Main.java    |  9 ++++
 .../homework_2/trafficlight/TrafficLight.java | 38 ++++++++++++++
 6 files changed, 143 insertions(+)
 create mode 100644 src/main/java/homework_2/pyramidprinter/Main.java
 create mode 100644 src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
 create mode 100644 src/main/java/homework_2/randomcharstable/Main.java
 create mode 100644 src/main/java/homework_2/randomcharstable/RandomCharsTable.java
 create mode 100644 src/main/java/homework_2/trafficlight/Main.java
 create mode 100644 src/main/java/homework_2/trafficlight/TrafficLight.java

diff --git a/src/main/java/homework_2/pyramidprinter/Main.java b/src/main/java/homework_2/pyramidprinter/Main.java
new file mode 100644
index 00000000..205d3d5c
--- /dev/null
+++ b/src/main/java/homework_2/pyramidprinter/Main.java
@@ -0,0 +1,9 @@
+package homework_2.pyramidprinter;
+
+public class Main {
+
+    public static void main(String[] args) {
+        PyramidPrinter pyramidPrinter = new PyramidPrinter();
+        pyramidPrinter.start(args[0]);
+    }
+}
diff --git a/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java b/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
new file mode 100644
index 00000000..67111d0f
--- /dev/null
+++ b/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
@@ -0,0 +1,28 @@
+package homework_2.pyramidprinter;
+
+import java.util.regex.Pattern;
+
+public class PyramidPrinter {
+
+    public void start(String sizeAsString) {
+        if (!isNumber(sizeAsString)) {
+            System.out.println("ERROR! This is not a number");
+            return;
+        }
+        int size = Integer.parseInt(sizeAsString);
+        if (size < 0) {
+            System.out.println("ERROR! Size is negative");
+            return;
+        }
+        for (int i = 0; i < size; i++) {
+            for (int j = 0; j <= i; j++) {
+                System.out.print("*");
+            }
+            System.out.println();
+        }
+    }
+
+    private boolean isNumber(String str) {
+        return !Pattern.matches(str, "-?[0-9]+");
+    }
+}
diff --git a/src/main/java/homework_2/randomcharstable/Main.java b/src/main/java/homework_2/randomcharstable/Main.java
new file mode 100644
index 00000000..5655738a
--- /dev/null
+++ b/src/main/java/homework_2/randomcharstable/Main.java
@@ -0,0 +1,10 @@
+package homework_2.randomcharstable;
+
+public class Main {
+
+    public static void main(String[] args) {
+        RandomCharsTable randomCharsTable = new RandomCharsTable();
+        String[] strings = {"5", "2", "even"};
+        randomCharsTable.start(strings);
+    }
+}
diff --git a/src/main/java/homework_2/randomcharstable/RandomCharsTable.java b/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
new file mode 100644
index 00000000..9fa93dbf
--- /dev/null
+++ b/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
@@ -0,0 +1,49 @@
+package homework_2.randomcharstable;
+
+import java.util.Random;
+import java.util.regex.Pattern;
+
+public class RandomCharsTable {
+    public void start(String[] params) {
+        if (!isNumber(params[0]) || !isNumber(params[1])) {
+            System.out.println("ERROR! This is not a number");
+            return;
+        }
+        int rows = Integer.parseInt(params[0]);
+        int columns = Integer.parseInt(params[1]);
+        if (rows == 0 || columns == 0) {
+            return;
+        }
+        if (rows < 0 || columns < 0) {
+            System.out.println("ERROR! One of the numbers is negative");
+            return;
+        }
+        String strategy = params[2];
+        int strategyMod;
+        if (strategy.equals("even")) {
+            strategyMod = 0;
+        } else if (strategy.equals("odd")){
+            strategyMod = 1;
+        } else {
+            System.out.println("ERROR! Unknown strategy");
+            return;
+        }
+        StringBuilder result = new StringBuilder(strategy + " letters - ");
+        for (int i = 0; i < rows; i++) {
+            System.out.print("| ");
+            for (int j = 0; j < columns; j++) {
+                char letter = (char) (65 + new Random().nextInt(26));
+                System.out.print(letter + " | ");
+                if (letter % 2 == strategyMod) {
+                    result.append(letter).append(", ");
+                }
+            }
+            System.out.println();
+        }
+        System.out.println(result.deleteCharAt(result.length() - 2));
+    }
+
+    private boolean isNumber(String str) {
+        return !Pattern.matches(str, "-?[0-9]+");
+    }
+}
diff --git a/src/main/java/homework_2/trafficlight/Main.java b/src/main/java/homework_2/trafficlight/Main.java
new file mode 100644
index 00000000..306f9cd1
--- /dev/null
+++ b/src/main/java/homework_2/trafficlight/Main.java
@@ -0,0 +1,9 @@
+package homework_2.trafficlight;
+
+public class Main {
+
+    public static void main(String[] args) {
+        TrafficLight trafficLight = new TrafficLight();
+        trafficLight.start(args[0]);
+    }
+}
diff --git a/src/main/java/homework_2/trafficlight/TrafficLight.java b/src/main/java/homework_2/trafficlight/TrafficLight.java
new file mode 100644
index 00000000..e8b7aa63
--- /dev/null
+++ b/src/main/java/homework_2/trafficlight/TrafficLight.java
@@ -0,0 +1,38 @@
+package homework_2.trafficlight;
+
+import java.time.Instant;
+import java.util.regex.Pattern;
+
+public class TrafficLight {
+
+    public void start(String secondsAsString) {
+        if (isNumber(secondsAsString)) {
+            System.out.println("ERROR! Seconds must be a number");
+            return;
+        }
+        long seconds = Long.parseLong(secondsAsString);
+        if (seconds < 0) {
+            System.out.println("ERROR! The seconds are negative");
+            return;
+        }
+        if (seconds > 86401) {
+            System.out.println("ERROR! The seconds are too long");
+            return;
+        }
+        Instant instant = Instant.ofEpochSecond(seconds);
+        String fullTime = instant.toString();
+        int size = fullTime.length();
+        int onlySeconds = Integer.parseInt(fullTime.substring(size - 3, size - 1));
+        if (onlySeconds >= 0 && onlySeconds <= 35) {
+            System.out.println("Зеленый");
+        } else if (onlySeconds >= 40 && onlySeconds <= 55) {
+            System.out.println("Красный");
+        } else {
+            System.out.println("Желтый");
+        }
+    }
+
+    private boolean isNumber(String str) {
+        return Pattern.matches(str, "-?[0-9]+");
+    }
+}

From 431d20179bb6e2c97530974f380556a3a070444f Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Tue, 20 Jul 2021 01:19:23 +0300
Subject: [PATCH 07/20] Rename package with homework 3

---
 README.md                                                      | 3 +++
 .../java/{homework_2 => homework_3}/pyramidprinter/Main.java   | 2 +-
 .../pyramidprinter/PyramidPrinter.java                         | 2 +-
 .../java/{homework_2 => homework_3}/randomcharstable/Main.java | 2 +-
 .../randomcharstable/RandomCharsTable.java                     | 2 +-
 .../java/{homework_2 => homework_3}/trafficlight/Main.java     | 2 +-
 .../{homework_2 => homework_3}/trafficlight/TrafficLight.java  | 2 +-
 7 files changed, 9 insertions(+), 6 deletions(-)
 rename src/main/java/{homework_2 => homework_3}/pyramidprinter/Main.java (83%)
 rename src/main/java/{homework_2 => homework_3}/pyramidprinter/PyramidPrinter.java (95%)
 rename src/main/java/{homework_2 => homework_3}/randomcharstable/Main.java (86%)
 rename src/main/java/{homework_2 => homework_3}/randomcharstable/RandomCharsTable.java (97%)
 rename src/main/java/{homework_2 => homework_3}/trafficlight/Main.java (83%)
 rename src/main/java/{homework_2 => homework_3}/trafficlight/TrafficLight.java (97%)

diff --git a/README.md b/README.md
index ee527ea5..fce380f1 100644
--- a/README.md
+++ b/README.md
@@ -5,5 +5,8 @@
 | Number | Solution  | Short description
 | --- | --- | --- |
 | HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
+| HW3_1 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
+| HW3_2 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
+| HW3_3 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
diff --git a/src/main/java/homework_2/pyramidprinter/Main.java b/src/main/java/homework_3/pyramidprinter/Main.java
similarity index 83%
rename from src/main/java/homework_2/pyramidprinter/Main.java
rename to src/main/java/homework_3/pyramidprinter/Main.java
index 205d3d5c..7c14e55e 100644
--- a/src/main/java/homework_2/pyramidprinter/Main.java
+++ b/src/main/java/homework_3/pyramidprinter/Main.java
@@ -1,4 +1,4 @@
-package homework_2.pyramidprinter;
+package homework_3.pyramidprinter;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java b/src/main/java/homework_3/pyramidprinter/PyramidPrinter.java
similarity index 95%
rename from src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
rename to src/main/java/homework_3/pyramidprinter/PyramidPrinter.java
index 67111d0f..e9898052 100644
--- a/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
+++ b/src/main/java/homework_3/pyramidprinter/PyramidPrinter.java
@@ -1,4 +1,4 @@
-package homework_2.pyramidprinter;
+package homework_3.pyramidprinter;
 
 import java.util.regex.Pattern;
 
diff --git a/src/main/java/homework_2/randomcharstable/Main.java b/src/main/java/homework_3/randomcharstable/Main.java
similarity index 86%
rename from src/main/java/homework_2/randomcharstable/Main.java
rename to src/main/java/homework_3/randomcharstable/Main.java
index 5655738a..76799f98 100644
--- a/src/main/java/homework_2/randomcharstable/Main.java
+++ b/src/main/java/homework_3/randomcharstable/Main.java
@@ -1,4 +1,4 @@
-package homework_2.randomcharstable;
+package homework_3.randomcharstable;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/randomcharstable/RandomCharsTable.java b/src/main/java/homework_3/randomcharstable/RandomCharsTable.java
similarity index 97%
rename from src/main/java/homework_2/randomcharstable/RandomCharsTable.java
rename to src/main/java/homework_3/randomcharstable/RandomCharsTable.java
index 9fa93dbf..4c546f48 100644
--- a/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
+++ b/src/main/java/homework_3/randomcharstable/RandomCharsTable.java
@@ -1,4 +1,4 @@
-package homework_2.randomcharstable;
+package homework_3.randomcharstable;
 
 import java.util.Random;
 import java.util.regex.Pattern;
diff --git a/src/main/java/homework_2/trafficlight/Main.java b/src/main/java/homework_3/trafficlight/Main.java
similarity index 83%
rename from src/main/java/homework_2/trafficlight/Main.java
rename to src/main/java/homework_3/trafficlight/Main.java
index 306f9cd1..52ac00c6 100644
--- a/src/main/java/homework_2/trafficlight/Main.java
+++ b/src/main/java/homework_3/trafficlight/Main.java
@@ -1,4 +1,4 @@
-package homework_2.trafficlight;
+package homework_3.trafficlight;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/trafficlight/TrafficLight.java b/src/main/java/homework_3/trafficlight/TrafficLight.java
similarity index 97%
rename from src/main/java/homework_2/trafficlight/TrafficLight.java
rename to src/main/java/homework_3/trafficlight/TrafficLight.java
index e8b7aa63..2db69064 100644
--- a/src/main/java/homework_2/trafficlight/TrafficLight.java
+++ b/src/main/java/homework_3/trafficlight/TrafficLight.java
@@ -1,4 +1,4 @@
-package homework_2.trafficlight;
+package homework_3.trafficlight;
 
 import java.time.Instant;
 import java.util.regex.Pattern;

From 3452255ba2753e2804aaa2cbc90ad333d7bedc91 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Tue, 20 Jul 2021 01:26:11 +0300
Subject: [PATCH 08/20] Added new homework and codingbat to README.md and fix
 style

---
 README.md | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index fce380f1..0223909d 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,14 @@
 # Java Core June 2021
 
-## *Nikolaev Artem*
+## *Antufiev Semen*
 
 | Number | Solution  | Short description
 | --- | --- | --- |
 | HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
-| HW3_1 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
-| HW3_2 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
-| HW3_3 | [Solution_3](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
+| HW3_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/pyramidprinter) | The app that reads input arguments and prints pyramid|
+| HW3_1 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/trafficlight) | The app that reads input arguments and prints color of traffic light now|
+| HW3_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/randomcharstable) | The app that reads input arguments and prints table with random charset|
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
+
+[codingbat](https://codingbat.com/done?user=alexantufiev@gmail.com&tag=8698341536)

From 8cc135ac6d075716445d1b65ee72b902a28b5d0c Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Sun, 25 Jul 2021 23:16:31 +0300
Subject: [PATCH 09/20] Rename package and init method to homework on run()

---
 .../java/{homework_3 => homework_2}/pyramidprinter/Main.java  | 4 ++--
 .../pyramidprinter/PyramidPrinter.java                        | 4 ++--
 .../{homework_3 => homework_2}/randomcharstable/Main.java     | 4 ++--
 .../randomcharstable/RandomCharsTable.java                    | 4 ++--
 .../java/{homework_3 => homework_2}/trafficlight/Main.java    | 4 ++--
 .../{homework_3 => homework_2}/trafficlight/TrafficLight.java | 4 ++--
 6 files changed, 12 insertions(+), 12 deletions(-)
 rename src/main/java/{homework_3 => homework_2}/pyramidprinter/Main.java (64%)
 rename src/main/java/{homework_3 => homework_2}/pyramidprinter/PyramidPrinter.java (89%)
 rename src/main/java/{homework_3 => homework_2}/randomcharstable/Main.java (70%)
 rename src/main/java/{homework_3 => homework_2}/randomcharstable/RandomCharsTable.java (95%)
 rename src/main/java/{homework_3 => homework_2}/trafficlight/Main.java (65%)
 rename src/main/java/{homework_3 => homework_2}/trafficlight/TrafficLight.java (93%)

diff --git a/src/main/java/homework_3/pyramidprinter/Main.java b/src/main/java/homework_2/pyramidprinter/Main.java
similarity index 64%
rename from src/main/java/homework_3/pyramidprinter/Main.java
rename to src/main/java/homework_2/pyramidprinter/Main.java
index 7c14e55e..3082ec19 100644
--- a/src/main/java/homework_3/pyramidprinter/Main.java
+++ b/src/main/java/homework_2/pyramidprinter/Main.java
@@ -1,9 +1,9 @@
-package homework_3.pyramidprinter;
+package homework_2.pyramidprinter;
 
 public class Main {
 
     public static void main(String[] args) {
         PyramidPrinter pyramidPrinter = new PyramidPrinter();
-        pyramidPrinter.start(args[0]);
+        pyramidPrinter.run(args[0]);
     }
 }
diff --git a/src/main/java/homework_3/pyramidprinter/PyramidPrinter.java b/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
similarity index 89%
rename from src/main/java/homework_3/pyramidprinter/PyramidPrinter.java
rename to src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
index e9898052..1f16c118 100644
--- a/src/main/java/homework_3/pyramidprinter/PyramidPrinter.java
+++ b/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
@@ -1,10 +1,10 @@
-package homework_3.pyramidprinter;
+package homework_2.pyramidprinter;
 
 import java.util.regex.Pattern;
 
 public class PyramidPrinter {
 
-    public void start(String sizeAsString) {
+    public void run(String sizeAsString) {
         if (!isNumber(sizeAsString)) {
             System.out.println("ERROR! This is not a number");
             return;
diff --git a/src/main/java/homework_3/randomcharstable/Main.java b/src/main/java/homework_2/randomcharstable/Main.java
similarity index 70%
rename from src/main/java/homework_3/randomcharstable/Main.java
rename to src/main/java/homework_2/randomcharstable/Main.java
index 76799f98..944b2bb4 100644
--- a/src/main/java/homework_3/randomcharstable/Main.java
+++ b/src/main/java/homework_2/randomcharstable/Main.java
@@ -1,10 +1,10 @@
-package homework_3.randomcharstable;
+package homework_2.randomcharstable;
 
 public class Main {
 
     public static void main(String[] args) {
         RandomCharsTable randomCharsTable = new RandomCharsTable();
         String[] strings = {"5", "2", "even"};
-        randomCharsTable.start(strings);
+        randomCharsTable.run(strings);
     }
 }
diff --git a/src/main/java/homework_3/randomcharstable/RandomCharsTable.java b/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
similarity index 95%
rename from src/main/java/homework_3/randomcharstable/RandomCharsTable.java
rename to src/main/java/homework_2/randomcharstable/RandomCharsTable.java
index 4c546f48..62dcb1b5 100644
--- a/src/main/java/homework_3/randomcharstable/RandomCharsTable.java
+++ b/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
@@ -1,10 +1,10 @@
-package homework_3.randomcharstable;
+package homework_2.randomcharstable;
 
 import java.util.Random;
 import java.util.regex.Pattern;
 
 public class RandomCharsTable {
-    public void start(String[] params) {
+    public void run(String[] params) {
         if (!isNumber(params[0]) || !isNumber(params[1])) {
             System.out.println("ERROR! This is not a number");
             return;
diff --git a/src/main/java/homework_3/trafficlight/Main.java b/src/main/java/homework_2/trafficlight/Main.java
similarity index 65%
rename from src/main/java/homework_3/trafficlight/Main.java
rename to src/main/java/homework_2/trafficlight/Main.java
index 52ac00c6..71d7f5f7 100644
--- a/src/main/java/homework_3/trafficlight/Main.java
+++ b/src/main/java/homework_2/trafficlight/Main.java
@@ -1,9 +1,9 @@
-package homework_3.trafficlight;
+package homework_2.trafficlight;
 
 public class Main {
 
     public static void main(String[] args) {
         TrafficLight trafficLight = new TrafficLight();
-        trafficLight.start(args[0]);
+        trafficLight.run(args[0]);
     }
 }
diff --git a/src/main/java/homework_3/trafficlight/TrafficLight.java b/src/main/java/homework_2/trafficlight/TrafficLight.java
similarity index 93%
rename from src/main/java/homework_3/trafficlight/TrafficLight.java
rename to src/main/java/homework_2/trafficlight/TrafficLight.java
index 2db69064..e3f3a87a 100644
--- a/src/main/java/homework_3/trafficlight/TrafficLight.java
+++ b/src/main/java/homework_2/trafficlight/TrafficLight.java
@@ -1,11 +1,11 @@
-package homework_3.trafficlight;
+package homework_2.trafficlight;
 
 import java.time.Instant;
 import java.util.regex.Pattern;
 
 public class TrafficLight {
 
-    public void start(String secondsAsString) {
+    public void run(String secondsAsString) {
         if (isNumber(secondsAsString)) {
             System.out.println("ERROR! Seconds must be a number");
             return;

From de07ae6f09b5e268f5899141ea557d5e52ca1397 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 26 Jul 2021 21:50:45 +0300
Subject: [PATCH 10/20] Rename packages

---
 .../homework_2/{pyramidprinter => pyramid_printer}/Main.java    | 2 +-
 .../{pyramidprinter => pyramid_printer}/PyramidPrinter.java     | 2 +-
 .../{randomcharstable => random_chars_table}/Main.java          | 2 +-
 .../RandomCharsTable.java                                       | 2 +-
 .../java/homework_2/{trafficlight => traffic_light}/Main.java   | 2 +-
 .../{trafficlight => traffic_light}/TrafficLight.java           | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)
 rename src/main/java/homework_2/{pyramidprinter => pyramid_printer}/Main.java (82%)
 rename src/main/java/homework_2/{pyramidprinter => pyramid_printer}/PyramidPrinter.java (95%)
 rename src/main/java/homework_2/{randomcharstable => random_chars_table}/Main.java (85%)
 rename src/main/java/homework_2/{randomcharstable => random_chars_table}/RandomCharsTable.java (97%)
 rename src/main/java/homework_2/{trafficlight => traffic_light}/Main.java (83%)
 rename src/main/java/homework_2/{trafficlight => traffic_light}/TrafficLight.java (97%)

diff --git a/src/main/java/homework_2/pyramidprinter/Main.java b/src/main/java/homework_2/pyramid_printer/Main.java
similarity index 82%
rename from src/main/java/homework_2/pyramidprinter/Main.java
rename to src/main/java/homework_2/pyramid_printer/Main.java
index 3082ec19..8b2ba643 100644
--- a/src/main/java/homework_2/pyramidprinter/Main.java
+++ b/src/main/java/homework_2/pyramid_printer/Main.java
@@ -1,4 +1,4 @@
-package homework_2.pyramidprinter;
+package homework_2.pyramid_printer;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
similarity index 95%
rename from src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
rename to src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
index 1f16c118..5846577d 100644
--- a/src/main/java/homework_2/pyramidprinter/PyramidPrinter.java
+++ b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
@@ -1,4 +1,4 @@
-package homework_2.pyramidprinter;
+package homework_2.pyramid_printer;
 
 import java.util.regex.Pattern;
 
diff --git a/src/main/java/homework_2/randomcharstable/Main.java b/src/main/java/homework_2/random_chars_table/Main.java
similarity index 85%
rename from src/main/java/homework_2/randomcharstable/Main.java
rename to src/main/java/homework_2/random_chars_table/Main.java
index 944b2bb4..34787c5d 100644
--- a/src/main/java/homework_2/randomcharstable/Main.java
+++ b/src/main/java/homework_2/random_chars_table/Main.java
@@ -1,4 +1,4 @@
-package homework_2.randomcharstable;
+package homework_2.random_chars_table;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/randomcharstable/RandomCharsTable.java b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
similarity index 97%
rename from src/main/java/homework_2/randomcharstable/RandomCharsTable.java
rename to src/main/java/homework_2/random_chars_table/RandomCharsTable.java
index 62dcb1b5..e2be2fe0 100644
--- a/src/main/java/homework_2/randomcharstable/RandomCharsTable.java
+++ b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
@@ -1,4 +1,4 @@
-package homework_2.randomcharstable;
+package homework_2.random_chars_table;
 
 import java.util.Random;
 import java.util.regex.Pattern;
diff --git a/src/main/java/homework_2/trafficlight/Main.java b/src/main/java/homework_2/traffic_light/Main.java
similarity index 83%
rename from src/main/java/homework_2/trafficlight/Main.java
rename to src/main/java/homework_2/traffic_light/Main.java
index 71d7f5f7..2f71a7f9 100644
--- a/src/main/java/homework_2/trafficlight/Main.java
+++ b/src/main/java/homework_2/traffic_light/Main.java
@@ -1,4 +1,4 @@
-package homework_2.trafficlight;
+package homework_2.traffic_light;
 
 public class Main {
 
diff --git a/src/main/java/homework_2/trafficlight/TrafficLight.java b/src/main/java/homework_2/traffic_light/TrafficLight.java
similarity index 97%
rename from src/main/java/homework_2/trafficlight/TrafficLight.java
rename to src/main/java/homework_2/traffic_light/TrafficLight.java
index e3f3a87a..0043d5fc 100644
--- a/src/main/java/homework_2/trafficlight/TrafficLight.java
+++ b/src/main/java/homework_2/traffic_light/TrafficLight.java
@@ -1,4 +1,4 @@
-package homework_2.trafficlight;
+package homework_2.traffic_light;
 
 import java.time.Instant;
 import java.util.regex.Pattern;

From 963ac04b4c74302c94744441e9264f391d6312ce Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 26 Jul 2021 22:05:54 +0300
Subject: [PATCH 11/20] Complete the homework 3

---
 src/main/java/homework_3/ImmutableClass.java | 65 ++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 src/main/java/homework_3/ImmutableClass.java

diff --git a/src/main/java/homework_3/ImmutableClass.java b/src/main/java/homework_3/ImmutableClass.java
new file mode 100644
index 00000000..7b6efed7
--- /dev/null
+++ b/src/main/java/homework_3/ImmutableClass.java
@@ -0,0 +1,65 @@
+package homework_3;
+
+
+/*
+The class must be declared as final
+Data members in the class must be declared as private
+Data members in the class must be declared as final
+A parameterized constructor should initialize all the fields performing a deep copy
+Deep Copy of objects should be performed in the getter methods
+No setters
+ */
+
+
+public final class ImmutableClass {
+
+    private final int age;
+
+    private final int high;
+
+    private final int weight;
+
+    private final String name;
+
+    public ImmutableClass(int age, int high, int weight, String name) {
+        this.age = age;
+        this.high = high;
+        this.weight = weight;
+        this.name = name;
+    }
+
+    public ImmutableClass(int weight, int high) {
+        this.high = high;
+        this.weight = weight;
+        this.age = 10;
+        this.name = "Some person";
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public int getHigh() {
+        return high;
+    }
+
+    public int getWeight() {
+        return weight;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public ImmutableClass changeWeightAndHigh(int weight, int high) {
+        return new ImmutableClass(weight, high);
+    }
+
+    public ImmutableClass changeName(String name) {
+        return new ImmutableClass(this.age, this.high, this.weight, name);
+    }
+
+    public ImmutableClass changeAge(int age) {
+        return new ImmutableClass(age, this.high, this.weight, this.name);
+    }
+}

From 65f4556f973867fde355cfe4f22b35398b8d4014 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 26 Jul 2021 22:08:15 +0300
Subject: [PATCH 12/20] Add homework 3 to README

---
 README.md | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0223909d..b85ea411 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,10 @@
 | Number | Solution  | Short description
 | --- | --- | --- |
 | HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
-| HW3_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/pyramidprinter) | The app that reads input arguments and prints pyramid|
-| HW3_1 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/trafficlight) | The app that reads input arguments and prints color of traffic light now|
-| HW3_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/randomcharstable) | The app that reads input arguments and prints table with random charset|
+| HW2_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/pyramidprinter) | The app that reads input arguments and prints pyramid|
+| HW2_2 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/trafficlight) | The app that reads input arguments and prints color of traffic light now|
+| HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/randomcharstable) | The app that reads input arguments and prints table with random charset|
+| HW3 | [Immutable_class](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3) | Example of immutable class
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
 

From 0ca6164b3b4547510a9e60ab659f7cbcf8ecc3b9 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 26 Jul 2021 22:10:03 +0300
Subject: [PATCH 13/20] Fix README urls for homework 2

---
 README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index b85ea411..9136907f 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,9 @@
 | Number | Solution  | Short description
 | --- | --- | --- |
 | HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
-| HW2_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/pyramidprinter) | The app that reads input arguments and prints pyramid|
-| HW2_2 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/trafficlight) | The app that reads input arguments and prints color of traffic light now|
-| HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3/randomcharstable) | The app that reads input arguments and prints table with random charset|
+| HW2_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/pyramid_printer) | The app that reads input arguments and prints pyramid|
+| HW2_2 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/traffic_light) | The app that reads input arguments and prints color of traffic light now|
+| HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/random_chars_table/randomcharstable) | The app that reads input arguments and prints table with random charset|
 | HW3 | [Immutable_class](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3) | Example of immutable class
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)

From 770b5c8a2e4c0d51a6ed9c1907657a27e516409c Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Fri, 30 Jul 2021 00:10:00 +0300
Subject: [PATCH 14/20] Add scanner to homework 2

---
 src/main/java/homework_2/pyramid_printer/Main.java        | 4 +++-
 .../java/homework_2/pyramid_printer/PyramidPrinter.java   | 5 ++++-
 src/main/java/homework_2/random_chars_table/Main.java     | 3 +--
 .../homework_2/random_chars_table/RandomCharsTable.java   | 8 +++++++-
 src/main/java/homework_2/traffic_light/Main.java          | 2 +-
 src/main/java/homework_2/traffic_light/TrafficLight.java  | 5 ++++-
 6 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/main/java/homework_2/pyramid_printer/Main.java b/src/main/java/homework_2/pyramid_printer/Main.java
index 8b2ba643..15409cef 100644
--- a/src/main/java/homework_2/pyramid_printer/Main.java
+++ b/src/main/java/homework_2/pyramid_printer/Main.java
@@ -4,6 +4,8 @@ public class Main {
 
     public static void main(String[] args) {
         PyramidPrinter pyramidPrinter = new PyramidPrinter();
-        pyramidPrinter.run(args[0]);
+        pyramidPrinter.run();
     }
+
+
 }
diff --git a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
index 5846577d..976cb9d6 100644
--- a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
+++ b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
@@ -1,10 +1,13 @@
 package homework_2.pyramid_printer;
 
+import java.util.Scanner;
 import java.util.regex.Pattern;
 
 public class PyramidPrinter {
 
-    public void run(String sizeAsString) {
+    public void run() {
+        Scanner scanner = new Scanner(System.in);
+        String sizeAsString = scanner.nextLine();
         if (!isNumber(sizeAsString)) {
             System.out.println("ERROR! This is not a number");
             return;
diff --git a/src/main/java/homework_2/random_chars_table/Main.java b/src/main/java/homework_2/random_chars_table/Main.java
index 34787c5d..e359a82c 100644
--- a/src/main/java/homework_2/random_chars_table/Main.java
+++ b/src/main/java/homework_2/random_chars_table/Main.java
@@ -4,7 +4,6 @@ public class Main {
 
     public static void main(String[] args) {
         RandomCharsTable randomCharsTable = new RandomCharsTable();
-        String[] strings = {"5", "2", "even"};
-        randomCharsTable.run(strings);
+        randomCharsTable.run();
     }
 }
diff --git a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
index e2be2fe0..3c76712b 100644
--- a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
+++ b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
@@ -1,10 +1,16 @@
 package homework_2.random_chars_table;
 
 import java.util.Random;
+import java.util.Scanner;
 import java.util.regex.Pattern;
 
 public class RandomCharsTable {
-    public void run(String[] params) {
+    public void run() {
+        Scanner scanner = new Scanner(System.in);
+        String[] params = new String[3];
+        for (int i = 0; i < params.length; i++) {
+            params[i] = scanner.next();
+        }
         if (!isNumber(params[0]) || !isNumber(params[1])) {
             System.out.println("ERROR! This is not a number");
             return;
diff --git a/src/main/java/homework_2/traffic_light/Main.java b/src/main/java/homework_2/traffic_light/Main.java
index 2f71a7f9..0b7b67da 100644
--- a/src/main/java/homework_2/traffic_light/Main.java
+++ b/src/main/java/homework_2/traffic_light/Main.java
@@ -4,6 +4,6 @@ public class Main {
 
     public static void main(String[] args) {
         TrafficLight trafficLight = new TrafficLight();
-        trafficLight.run(args[0]);
+        trafficLight.run();
     }
 }
diff --git a/src/main/java/homework_2/traffic_light/TrafficLight.java b/src/main/java/homework_2/traffic_light/TrafficLight.java
index 0043d5fc..9f331cc7 100644
--- a/src/main/java/homework_2/traffic_light/TrafficLight.java
+++ b/src/main/java/homework_2/traffic_light/TrafficLight.java
@@ -1,11 +1,14 @@
 package homework_2.traffic_light;
 
 import java.time.Instant;
+import java.util.Scanner;
 import java.util.regex.Pattern;
 
 public class TrafficLight {
 
-    public void run(String secondsAsString) {
+    public void run() {
+        Scanner scanner = new Scanner(System.in);
+        String secondsAsString = scanner.next();
         if (isNumber(secondsAsString)) {
             System.out.println("ERROR! Seconds must be a number");
             return;

From 7a446d2de6236bd8fee988ff52c3073076c9b464 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Thu, 5 Aug 2021 19:33:27 +0300
Subject: [PATCH 15/20] Rework README.md and fix output message for incorrect
 params

---
 README.md                                                 | 2 +-
 .../java/homework_2/pyramid_printer/PyramidPrinter.java   | 7 +++++--
 .../homework_2/random_chars_table/RandomCharsTable.java   | 7 ++++---
 src/main/java/homework_2/traffic_light/TrafficLight.java  | 8 +++++---
 4 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 9136907f..8f82d272 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 | HW1 | [Solution_1](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_1) | The app that reads input arguments and prints them, until "error" argument |
 | HW2_1 | [Pyramid printer](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/pyramid_printer) | The app that reads input arguments and prints pyramid|
 | HW2_2 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/traffic_light) | The app that reads input arguments and prints color of traffic light now|
-| HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/random_chars_table/randomcharstable) | The app that reads input arguments and prints table with random charset|
+| HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/random_chars_table) | The app that reads input arguments and prints table with random charset|
 | HW3 | [Immutable_class](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3) | Example of immutable class
 
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
diff --git a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
index 976cb9d6..107f0f6d 100644
--- a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
+++ b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
@@ -5,16 +5,19 @@
 
 public class PyramidPrinter {
 
+    public static final String ERROR_MESSAGE = "Only 1 non-negative integer is allowed as passed parameter";
+
     public void run() {
         Scanner scanner = new Scanner(System.in);
         String sizeAsString = scanner.nextLine();
+
         if (!isNumber(sizeAsString)) {
-            System.out.println("ERROR! This is not a number");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         int size = Integer.parseInt(sizeAsString);
         if (size < 0) {
-            System.out.println("ERROR! Size is negative");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         for (int i = 0; i < size; i++) {
diff --git a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
index 3c76712b..d6249570 100644
--- a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
+++ b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
@@ -5,6 +5,7 @@
 import java.util.regex.Pattern;
 
 public class RandomCharsTable {
+    public static final String ERROR_MESSAGE  = "Passed parameters should match the format [positive integer] [positive integer] [even|odd]";
     public void run() {
         Scanner scanner = new Scanner(System.in);
         String[] params = new String[3];
@@ -12,7 +13,7 @@ public void run() {
             params[i] = scanner.next();
         }
         if (!isNumber(params[0]) || !isNumber(params[1])) {
-            System.out.println("ERROR! This is not a number");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         int rows = Integer.parseInt(params[0]);
@@ -21,7 +22,7 @@ public void run() {
             return;
         }
         if (rows < 0 || columns < 0) {
-            System.out.println("ERROR! One of the numbers is negative");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         String strategy = params[2];
@@ -31,7 +32,7 @@ public void run() {
         } else if (strategy.equals("odd")){
             strategyMod = 1;
         } else {
-            System.out.println("ERROR! Unknown strategy");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         StringBuilder result = new StringBuilder(strategy + " letters - ");
diff --git a/src/main/java/homework_2/traffic_light/TrafficLight.java b/src/main/java/homework_2/traffic_light/TrafficLight.java
index 9f331cc7..fa62351e 100644
--- a/src/main/java/homework_2/traffic_light/TrafficLight.java
+++ b/src/main/java/homework_2/traffic_light/TrafficLight.java
@@ -6,20 +6,22 @@
 
 public class TrafficLight {
 
+    public static final String ERROR_MESSAGE = "Only 1 non-negative integer is allowed as passed parameter";
+
     public void run() {
         Scanner scanner = new Scanner(System.in);
         String secondsAsString = scanner.next();
         if (isNumber(secondsAsString)) {
-            System.out.println("ERROR! Seconds must be a number");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         long seconds = Long.parseLong(secondsAsString);
         if (seconds < 0) {
-            System.out.println("ERROR! The seconds are negative");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         if (seconds > 86401) {
-            System.out.println("ERROR! The seconds are too long");
+            System.out.println(ERROR_MESSAGE);
             return;
         }
         Instant instant = Instant.ofEpochSecond(seconds);

From c7a5739cac04f2697dbf8131f55cb4621bad447a Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Sat, 7 Aug 2021 16:43:02 +0300
Subject: [PATCH 16/20] Complete homework 4

---
 .../java/homework_2/traffic_light/Main.java   |  2 +
 .../custom_annotation/DefaulValueImpl.java    | 72 +++++++++++++++++++
 .../custom_annotation/DefaultValue.java       | 15 ++++
 .../homework_4/custom_annotation/Main.java    | 60 ++++++++++++++++
 .../custom_file_reader/CustomFileReader.java  | 56 +++++++++++++++
 .../homework_4/custom_file_reader/Main.java   | 10 +++
 src/main/java/homework_4/singleton/Main.java  | 12 ++++
 .../java/homework_4/singleton/Singleton.java  | 23 ++++++
 .../resources/custom_file_reader/input.txt    |  1 +
 9 files changed, 251 insertions(+)
 create mode 100644 src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
 create mode 100644 src/main/java/homework_4/custom_annotation/DefaultValue.java
 create mode 100644 src/main/java/homework_4/custom_annotation/Main.java
 create mode 100644 src/main/java/homework_4/custom_file_reader/CustomFileReader.java
 create mode 100644 src/main/java/homework_4/custom_file_reader/Main.java
 create mode 100644 src/main/java/homework_4/singleton/Main.java
 create mode 100644 src/main/java/homework_4/singleton/Singleton.java
 create mode 100644 src/main/resources/custom_file_reader/input.txt

diff --git a/src/main/java/homework_2/traffic_light/Main.java b/src/main/java/homework_2/traffic_light/Main.java
index 0b7b67da..747b3666 100644
--- a/src/main/java/homework_2/traffic_light/Main.java
+++ b/src/main/java/homework_2/traffic_light/Main.java
@@ -6,4 +6,6 @@ public static void main(String[] args) {
         TrafficLight trafficLight = new TrafficLight();
         trafficLight.run();
     }
+
+
 }
diff --git a/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java b/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
new file mode 100644
index 00000000..982cd43f
--- /dev/null
+++ b/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
@@ -0,0 +1,72 @@
+package homework_4.custom_annotation;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class DefaulValueImpl {
+
+    public void insetDefaultValue(Object object) throws IllegalAccessException, InvocationTargetException {
+        setDefaultValueToFields(object, object.getClass());
+        setDefaultValueToMethods(object, object.getClass());
+
+
+    }
+
+    private void setDefaultValueToMethods(Object object, Class<?> clazz) throws InvocationTargetException, IllegalAccessException {
+        List<Method> collectPrivateMethods = Arrays.stream(clazz.getDeclaredMethods())
+                .filter((o) -> o.isAnnotationPresent(DefaultValue.class))
+                .collect(Collectors.toList());
+        setDefaultValueMethods(collectPrivateMethods, clazz, object);
+    }
+
+    private void setDefaultValueToFields(Object object, Class<?> clazz) throws IllegalAccessException {
+        List<Field> collectPublic = Arrays.stream(clazz.getFields())
+                .filter((o) -> o.isAnnotationPresent(DefaultValue.class))
+                .collect(Collectors.toList());
+        getDefaultFields(collectPublic, clazz, object);
+
+        List<Field> collectPrivate = Arrays.stream(clazz.getDeclaredFields())
+                .filter((o) -> o.isAnnotationPresent(DefaultValue.class))
+                .collect(Collectors.toList());
+        getDefaultFields(collectPrivate, clazz, object);
+
+    }
+
+    private void setDefaultValueMethods(List<Method> collectMethods, Class<?> clazz, Object object) throws InvocationTargetException, IllegalAccessException {
+        for (Method method : collectMethods) {
+            DefaultValue annotation = method.getAnnotation(DefaultValue.class);
+            String value = annotation.value();
+            Class<?> type = method.getParameterTypes()[0];
+            method.setAccessible(true);
+            if (type == Integer.class || type == int.class) {
+                method.invoke(object, Integer.parseInt(value));
+            } else if (type == Double.class || type == double.class) {
+                method.invoke(object, Double.parseDouble(value));
+            } else {
+                method.invoke(object, value);
+            }
+        }
+    }
+
+    private void getDefaultFields(List<Field> collect, Class<?> clazz, Object object) throws IllegalAccessException {
+        for (Field field : collect) {
+            DefaultValue annotation = field.getAnnotation(DefaultValue.class);
+            String value = annotation.value();
+            Class<?> type = field.getType();
+            field.setAccessible(true);
+            if (type == Integer.class || type == int.class) {
+                if (field.get(object) == null || field.get(object).equals(0))
+                    field.set(object, Integer.parseInt(value));
+            } else if (type == Double.class || type == double.class) {
+                if (field.get(object) == null || field.get(object).equals(0.0))
+                    field.set(object, Double.parseDouble(value));
+            } else {
+                if (field.get(object) == null || field.get(object).equals("")) field.set(object, value);
+            }
+        }
+    }
+}
diff --git a/src/main/java/homework_4/custom_annotation/DefaultValue.java b/src/main/java/homework_4/custom_annotation/DefaultValue.java
new file mode 100644
index 00000000..5325a90f
--- /dev/null
+++ b/src/main/java/homework_4/custom_annotation/DefaultValue.java
@@ -0,0 +1,15 @@
+package homework_4.custom_annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.METHOD, ElementType.FIELD})
+public @interface DefaultValue {
+    String value();
+
+}
diff --git a/src/main/java/homework_4/custom_annotation/Main.java b/src/main/java/homework_4/custom_annotation/Main.java
new file mode 100644
index 00000000..d1819e93
--- /dev/null
+++ b/src/main/java/homework_4/custom_annotation/Main.java
@@ -0,0 +1,60 @@
+package homework_4.custom_annotation;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class Main {
+
+    public static void main(String[] args) throws IllegalAccessException, InvocationTargetException {
+        Cat cat = new Cat();
+        new DefaulValueImpl().insetDefaultValue(cat);
+    }
+}
+
+class Cat {
+    @DefaultValue("1")
+    private int integer;
+    @DefaultValue("1.0")
+    private Double aDouble;
+    @DefaultValue("awdawd")
+    private String string;
+
+
+    public Cat(Integer integer, Double aDouble, String string) {
+        this.integer = integer;
+        this.aDouble = aDouble;
+        this.string = string;
+    }
+
+    public Cat() {
+    }
+
+    @DefaultValue("15")
+    public int method(int i) {
+        System.out.println(i);
+        return i;
+    }
+
+    @DefaultValue("awdawd")
+    private String method2(String i) {
+        System.out.println(i);
+        return i;
+    }
+
+    @DefaultValue("15.0")
+    protected Double method(Double i) {
+        System.out.println(i);
+        return i;
+    }
+
+    public Integer getInteger() {
+        return integer;
+    }
+
+    public Double getaDouble() {
+        return aDouble;
+    }
+
+    public String getString() {
+        return string;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/homework_4/custom_file_reader/CustomFileReader.java b/src/main/java/homework_4/custom_file_reader/CustomFileReader.java
new file mode 100644
index 00000000..980d97f7
--- /dev/null
+++ b/src/main/java/homework_4/custom_file_reader/CustomFileReader.java
@@ -0,0 +1,56 @@
+package homework_4.custom_file_reader;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Scanner;
+import java.util.stream.Stream;
+
+public class CustomFileReader {
+
+    private static final String PATH = "src/main/resources/custom_file_reader/input.txt";
+
+    public CustomFileReader() {
+    }
+
+    public void run1() {
+        File file = new File(PATH);
+        try (Scanner scanner = new Scanner(file)) {
+            String string = scanner.nextLine();
+            String replace = string.replace(".", "");
+            System.out.println(replace.replace(",", ""));
+        } catch (FileNotFoundException ignore) {
+        }
+    }
+
+    public void run2() {
+        Path path = Paths.get(PATH);
+        try (Stream<String> stream = Files.lines(path)) {
+            String result = stream
+                    .flatMapToInt(CharSequence::chars)
+                    .filter(c -> c != 44 && c != 46)
+                    .mapToObj(i -> (char) i)
+                    .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
+                    .toString();
+            System.out.println(result);
+        } catch (IOException ignore) {
+        }
+    }
+
+    public void run3() {
+        File file = new File(PATH);
+        try (FileReader fileReader = new FileReader(file)) {
+            BufferedReader bufferedReader = new BufferedReader(fileReader);
+            String line = bufferedReader.readLine();
+            String replace = line.replace(".", "");
+            System.out.println(replace.replace(",", ""));
+        } catch (IOException e) {
+        }
+
+    }
+}
diff --git a/src/main/java/homework_4/custom_file_reader/Main.java b/src/main/java/homework_4/custom_file_reader/Main.java
new file mode 100644
index 00000000..e8db6df5
--- /dev/null
+++ b/src/main/java/homework_4/custom_file_reader/Main.java
@@ -0,0 +1,10 @@
+package homework_4.custom_file_reader;
+
+public class Main {
+
+    public static void main(String[] args) {
+        new CustomFileReader().run1();
+        new CustomFileReader().run2();
+        new CustomFileReader().run3();
+    }
+}
diff --git a/src/main/java/homework_4/singleton/Main.java b/src/main/java/homework_4/singleton/Main.java
new file mode 100644
index 00000000..88d979d4
--- /dev/null
+++ b/src/main/java/homework_4/singleton/Main.java
@@ -0,0 +1,12 @@
+package homework_4.singleton;
+
+public class Main {
+
+    public static void main(String[] args) {
+        Singleton singleton = Singleton.getInstance();
+        Singleton singleton1 = Singleton.getInstance();
+        if (singleton == singleton1) {
+            System.out.println("yes");
+        }
+    }
+}
diff --git a/src/main/java/homework_4/singleton/Singleton.java b/src/main/java/homework_4/singleton/Singleton.java
new file mode 100644
index 00000000..880d6b46
--- /dev/null
+++ b/src/main/java/homework_4/singleton/Singleton.java
@@ -0,0 +1,23 @@
+package homework_4.singleton;
+
+import java.util.Random;
+
+public class Singleton {
+
+    private static Singleton singleton = null;
+
+    private Singleton() {
+
+    }
+
+    public static Singleton getInstance() {
+        if (singleton == null) {
+            singleton = new Singleton();
+        }
+        return singleton;
+    }
+
+    public Integer getRandom() {
+        return new Random().nextInt();
+    }
+}
diff --git a/src/main/resources/custom_file_reader/input.txt b/src/main/resources/custom_file_reader/input.txt
new file mode 100644
index 00000000..4abee03a
--- /dev/null
+++ b/src/main/resources/custom_file_reader/input.txt
@@ -0,0 +1 @@
+awdwadawda.awdaw,awdawdawd,awd,awd,awd,aw,da.wd.aw.da.wd.awd.aw.dawd,aw,da.wd,a.
\ No newline at end of file

From 560a704a46458789bfa7e40e5f9880c9f5e48f74 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Sat, 7 Aug 2021 16:47:26 +0300
Subject: [PATCH 17/20] Add homework 4 to README.md

---
 README.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 8f82d272..34e04d76 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,9 @@
 | HW2_2 | [Traffic light](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/traffic_light) | The app that reads input arguments and prints color of traffic light now|
 | HW2_3 | [Random chars table](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_2/random_chars_table) | The app that reads input arguments and prints table with random charset|
 | HW3 | [Immutable_class](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_3) | Example of immutable class
-
+| HW4_1 | [Custon_anotation](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_4/custom_annotation) | Custom annotation and handler 
+| HW4_2 | [Singleton](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_4/singleton) | Example of singleton class
+| HW4_3 | [Custom_file_reader](https://github.com/NikolaevArtem/Java_Core_June_2021/tree/feature/SemenAntufiev/src/main/java/homework_4/custom_file_reader) | Work with file readers
 [Link to markdown giude](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
 
 [codingbat](https://codingbat.com/done?user=alexantufiev@gmail.com&tag=8698341536)

From 6cc3fbe676b05b607e2054bb76de7585ae1e668a Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 9 Aug 2021 21:39:03 +0300
Subject: [PATCH 18/20] Add tests for homeworks

---
 build.gradle                                  |   2 +
 .../pyramid_printer/PyramidPrinter.java       |   8 +-
 .../random_chars_table/RandomCharsTable.java  |   4 +-
 .../traffic_light/TrafficLight.java           |  17 +--
 src/main/java/homework_3/ImmutableClass.java  |  15 ++
 .../custom_annotation/DefaulValueImpl.java    |  10 +-
 .../homework_4/custom_annotation/Main.java    |   2 +-
 .../java/homework_4/singleton/Singleton.java  |   6 -
 src/test/java/base/UnitBase.java              |  73 ++++++++++
 src/test/java/homework_1/HomeworkTest.java    |  17 +++
 .../pyramid_printer/PyramidPrinterTest.java   |  49 +++++++
 .../RandomCharsTableTest.java                 |  50 +++++++
 .../traffic_light/TrafficLightTest.java       |  58 ++++++++
 .../java/homework_3/ImmutableClassTest.java   |  23 ++++
 .../CustomAnnotationTest.java                 | 129 ++++++++++++++++++
 .../CustomFileReaderTest.java                 |  34 +++++
 .../homework_4/singleton/SingletonTest.java   |  15 ++
 17 files changed, 484 insertions(+), 28 deletions(-)
 create mode 100644 src/test/java/base/UnitBase.java
 create mode 100644 src/test/java/homework_1/HomeworkTest.java
 create mode 100644 src/test/java/homework_2/pyramid_printer/PyramidPrinterTest.java
 create mode 100644 src/test/java/homework_2/random_chars_table/RandomCharsTableTest.java
 create mode 100644 src/test/java/homework_2/traffic_light/TrafficLightTest.java
 create mode 100644 src/test/java/homework_3/ImmutableClassTest.java
 create mode 100644 src/test/java/homework_4/custom_annotation/CustomAnnotationTest.java
 create mode 100644 src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
 create mode 100644 src/test/java/homework_4/singleton/SingletonTest.java

diff --git a/build.gradle b/build.gradle
index b91dc843..386586ba 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,8 +10,10 @@ repositories {
 }
 
 dependencies {
+    implementation 'org.junit.jupiter:junit-jupiter:5.4.2'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
+    compileOnly group: 'org.projectlombok', name: 'lombok', version: '1.18.20'
 }
 
 test {
diff --git a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
index 107f0f6d..b9d8f221 100644
--- a/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
+++ b/src/main/java/homework_2/pyramid_printer/PyramidPrinter.java
@@ -11,15 +11,11 @@ public void run() {
         Scanner scanner = new Scanner(System.in);
         String sizeAsString = scanner.nextLine();
 
-        if (!isNumber(sizeAsString)) {
+        if (isNumber(sizeAsString)) {
             System.out.println(ERROR_MESSAGE);
             return;
         }
         int size = Integer.parseInt(sizeAsString);
-        if (size < 0) {
-            System.out.println(ERROR_MESSAGE);
-            return;
-        }
         for (int i = 0; i < size; i++) {
             for (int j = 0; j <= i; j++) {
                 System.out.print("*");
@@ -29,6 +25,6 @@ public void run() {
     }
 
     private boolean isNumber(String str) {
-        return !Pattern.matches(str, "-?[0-9]+");
+        return !Pattern.matches( "[0-9]+", str);
     }
 }
diff --git a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
index d6249570..b592032a 100644
--- a/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
+++ b/src/main/java/homework_2/random_chars_table/RandomCharsTable.java
@@ -12,7 +12,7 @@ public void run() {
         for (int i = 0; i < params.length; i++) {
             params[i] = scanner.next();
         }
-        if (!isNumber(params[0]) || !isNumber(params[1])) {
+        if (isNumber(params[0]) || isNumber(params[1])) {
             System.out.println(ERROR_MESSAGE);
             return;
         }
@@ -51,6 +51,6 @@ public void run() {
     }
 
     private boolean isNumber(String str) {
-        return !Pattern.matches(str, "-?[0-9]+");
+        return !Pattern.matches( "[0-9]+", str);
     }
 }
diff --git a/src/main/java/homework_2/traffic_light/TrafficLight.java b/src/main/java/homework_2/traffic_light/TrafficLight.java
index fa62351e..60e3a25f 100644
--- a/src/main/java/homework_2/traffic_light/TrafficLight.java
+++ b/src/main/java/homework_2/traffic_light/TrafficLight.java
@@ -7,6 +7,7 @@
 public class TrafficLight {
 
     public static final String ERROR_MESSAGE = "Only 1 non-negative integer is allowed as passed parameter";
+    public static final String DAY_OVER = "The day is over";
 
     public void run() {
         Scanner scanner = new Scanner(System.in);
@@ -20,24 +21,24 @@ public void run() {
             System.out.println(ERROR_MESSAGE);
             return;
         }
-        if (seconds > 86401) {
-            System.out.println(ERROR_MESSAGE);
+        if (seconds > 86399) {
+            System.out.println(DAY_OVER);
             return;
         }
         Instant instant = Instant.ofEpochSecond(seconds);
         String fullTime = instant.toString();
         int size = fullTime.length();
         int onlySeconds = Integer.parseInt(fullTime.substring(size - 3, size - 1));
-        if (onlySeconds >= 0 && onlySeconds <= 35) {
-            System.out.println("Зеленый");
-        } else if (onlySeconds >= 40 && onlySeconds <= 55) {
-            System.out.println("Красный");
+        if (onlySeconds >= 0 && onlySeconds < 35) {
+            System.out.println("Green");
+        } else if (onlySeconds >= 40 && onlySeconds < 55) {
+            System.out.println("Red");
         } else {
-            System.out.println("Желтый");
+            System.out.println("Yellow");
         }
     }
 
     private boolean isNumber(String str) {
-        return Pattern.matches(str, "-?[0-9]+");
+        return !Pattern.matches( "[0-9]+", str);
     }
 }
diff --git a/src/main/java/homework_3/ImmutableClass.java b/src/main/java/homework_3/ImmutableClass.java
index 7b6efed7..ff59afa1 100644
--- a/src/main/java/homework_3/ImmutableClass.java
+++ b/src/main/java/homework_3/ImmutableClass.java
@@ -11,6 +11,8 @@
  */
 
 
+import java.util.Objects;
+
 public final class ImmutableClass {
 
     private final int age;
@@ -62,4 +64,17 @@ public ImmutableClass changeName(String name) {
     public ImmutableClass changeAge(int age) {
         return new ImmutableClass(age, this.high, this.weight, this.name);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof ImmutableClass)) return false;
+        ImmutableClass that = (ImmutableClass) o;
+        return age == that.age && high == that.high && weight == that.weight && Objects.equals(name, that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(age, high, weight, name);
+    }
 }
diff --git a/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java b/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
index 982cd43f..d32b99e8 100644
--- a/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
+++ b/src/main/java/homework_4/custom_annotation/DefaulValueImpl.java
@@ -9,21 +9,21 @@
 
 public class DefaulValueImpl {
 
-    public void insetDefaultValue(Object object) throws IllegalAccessException, InvocationTargetException {
+    public static void insetDefaultValue(Object object) throws IllegalAccessException, InvocationTargetException {
         setDefaultValueToFields(object, object.getClass());
         setDefaultValueToMethods(object, object.getClass());
 
 
     }
 
-    private void setDefaultValueToMethods(Object object, Class<?> clazz) throws InvocationTargetException, IllegalAccessException {
+    private static void setDefaultValueToMethods(Object object, Class<?> clazz) throws InvocationTargetException, IllegalAccessException {
         List<Method> collectPrivateMethods = Arrays.stream(clazz.getDeclaredMethods())
                 .filter((o) -> o.isAnnotationPresent(DefaultValue.class))
                 .collect(Collectors.toList());
         setDefaultValueMethods(collectPrivateMethods, clazz, object);
     }
 
-    private void setDefaultValueToFields(Object object, Class<?> clazz) throws IllegalAccessException {
+    private static void setDefaultValueToFields(Object object, Class<?> clazz) throws IllegalAccessException {
         List<Field> collectPublic = Arrays.stream(clazz.getFields())
                 .filter((o) -> o.isAnnotationPresent(DefaultValue.class))
                 .collect(Collectors.toList());
@@ -36,7 +36,7 @@ private void setDefaultValueToFields(Object object, Class<?> clazz) throws Illeg
 
     }
 
-    private void setDefaultValueMethods(List<Method> collectMethods, Class<?> clazz, Object object) throws InvocationTargetException, IllegalAccessException {
+    private static void setDefaultValueMethods(List<Method> collectMethods, Class<?> clazz, Object object) throws InvocationTargetException, IllegalAccessException {
         for (Method method : collectMethods) {
             DefaultValue annotation = method.getAnnotation(DefaultValue.class);
             String value = annotation.value();
@@ -52,7 +52,7 @@ private void setDefaultValueMethods(List<Method> collectMethods, Class<?> clazz,
         }
     }
 
-    private void getDefaultFields(List<Field> collect, Class<?> clazz, Object object) throws IllegalAccessException {
+    private static void getDefaultFields(List<Field> collect, Class<?> clazz, Object object) throws IllegalAccessException {
         for (Field field : collect) {
             DefaultValue annotation = field.getAnnotation(DefaultValue.class);
             String value = annotation.value();
diff --git a/src/main/java/homework_4/custom_annotation/Main.java b/src/main/java/homework_4/custom_annotation/Main.java
index d1819e93..87136bee 100644
--- a/src/main/java/homework_4/custom_annotation/Main.java
+++ b/src/main/java/homework_4/custom_annotation/Main.java
@@ -6,7 +6,7 @@ public class Main {
 
     public static void main(String[] args) throws IllegalAccessException, InvocationTargetException {
         Cat cat = new Cat();
-        new DefaulValueImpl().insetDefaultValue(cat);
+        DefaulValueImpl.insetDefaultValue(cat);
     }
 }
 
diff --git a/src/main/java/homework_4/singleton/Singleton.java b/src/main/java/homework_4/singleton/Singleton.java
index 880d6b46..8e3f38e0 100644
--- a/src/main/java/homework_4/singleton/Singleton.java
+++ b/src/main/java/homework_4/singleton/Singleton.java
@@ -1,7 +1,5 @@
 package homework_4.singleton;
 
-import java.util.Random;
-
 public class Singleton {
 
     private static Singleton singleton = null;
@@ -16,8 +14,4 @@ public static Singleton getInstance() {
         }
         return singleton;
     }
-
-    public Integer getRandom() {
-        return new Random().nextInt();
-    }
 }
diff --git a/src/test/java/base/UnitBase.java b/src/test/java/base/UnitBase.java
new file mode 100644
index 00000000..8b46be60
--- /dev/null
+++ b/src/test/java/base/UnitBase.java
@@ -0,0 +1,73 @@
+package base;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintStream;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+
+public abstract class UnitBase {
+
+    protected ByteArrayOutputStream mockedOut = new ByteArrayOutputStream();
+    protected final PrintStream originalOut = System.out;
+    protected final InputStream originalIn = System.in;
+
+    @BeforeEach
+    void setUpStreams() {
+        System.setOut(new PrintStream(mockedOut));
+    }
+
+    @AfterEach
+    void restoreStreams() {
+        System.setOut(originalOut);
+        System.setIn(originalIn);
+    }
+
+    // mock input as if you wrote it to console by hand
+    protected void setInput(String input) {
+        System.setIn(new ByteArrayInputStream(input.getBytes()));
+    }
+
+    // returns whole output as string, will all line separators and etc
+    protected String getOutput() {
+        return mockedOut.toString().trim();
+    }
+
+    // output as array, separated by lines. First line - getOutputLines()[0], and so on
+    protected String[] getOutputLines() {
+        return getOutput().split("\\r?\\n");
+    }
+
+    // can be used to remove some strings from output (ex. remove "Please input number"). Put after run()
+    protected void removeFromOutput(String s) {
+        try {
+            String output = mockedOut.toString();
+            mockedOut.reset();
+            mockedOut.write(output.replace(s, "").getBytes());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // can be used to print output to testing console. Useful for debugging. Put after run();
+    protected void printOut() {
+        System.setOut(originalOut);
+        System.out.println(mockedOut);
+        System.setOut(new PrintStream(mockedOut));
+    }
+
+//  @Test
+//  void example() {
+//    setInput("2");
+//
+//    new PyramidPrinter().run();
+//    printOut();
+//    removeFromOutput("Please input number"):
+//
+//    assertEquals("x", getOutputLines()[0]);
+//    assertEquals("xx", getOutputLines()[1]);
+//  }
+
+}
diff --git a/src/test/java/homework_1/HomeworkTest.java b/src/test/java/homework_1/HomeworkTest.java
new file mode 100644
index 00000000..9299270e
--- /dev/null
+++ b/src/test/java/homework_1/HomeworkTest.java
@@ -0,0 +1,17 @@
+package homework_1;
+
+import base.UnitBase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class HomeworkTest extends UnitBase {
+
+    @Test
+    public void ErrorArgumentTest() {
+        String[] strings = new String[]{"word", "another word", "error"};
+        String[] stringsExpected = new String[]{"word : 4 letters", "another word : 12 letters", "\u001B[41m" + "Alarm!" + "\u001B[0m"};
+        Main.main(strings);
+        printOut();
+        Assertions.assertArrayEquals(stringsExpected, getOutputLines());
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/homework_2/pyramid_printer/PyramidPrinterTest.java b/src/test/java/homework_2/pyramid_printer/PyramidPrinterTest.java
new file mode 100644
index 00000000..01b42456
--- /dev/null
+++ b/src/test/java/homework_2/pyramid_printer/PyramidPrinterTest.java
@@ -0,0 +1,49 @@
+package homework_2.pyramid_printer;
+
+import base.UnitBase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+
+public class PyramidPrinterTest extends UnitBase {
+
+    public static final String ERROR_MESSAGE = "Only 1 non-negative integer is allowed as passed parameter";
+
+    @Test
+    public void notNumberArgumentTest() {
+        PyramidPrinter pyramidPrinter = new PyramidPrinter();
+        setInput("number");
+        pyramidPrinter.run();
+        printOut();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void zeroNumberArgument() {
+        PyramidPrinter pyramidPrinter = new PyramidPrinter();
+        setInput("0");
+        pyramidPrinter.run();
+        printOut();
+        Assertions.assertEquals("", getOutputLines()[0]);
+    }
+
+    @Test
+    public void negativeNumberArgument() {
+        PyramidPrinter pyramidPrinter = new PyramidPrinter();
+        setInput("-1");
+        pyramidPrinter.run();
+        printOut();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void pyramidTest() {
+        PyramidPrinter pyramidPrinter = new PyramidPrinter();
+        setInput("5");
+        pyramidPrinter.run();
+        printOut();
+        String[] expected = "* ** *** **** *****".split(" ");
+        String[] actual = getOutputLines();
+        Assertions.assertArrayEquals(expected, actual);
+    }
+}
diff --git a/src/test/java/homework_2/random_chars_table/RandomCharsTableTest.java b/src/test/java/homework_2/random_chars_table/RandomCharsTableTest.java
new file mode 100644
index 00000000..5fe63395
--- /dev/null
+++ b/src/test/java/homework_2/random_chars_table/RandomCharsTableTest.java
@@ -0,0 +1,50 @@
+package homework_2.random_chars_table;
+
+import base.UnitBase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class RandomCharsTableTest extends UnitBase {
+
+    public static final String ERROR_MESSAGE  = "Passed parameters should match the format [positive integer] [positive integer] [even|odd]";
+
+    @Test
+    public void notNumberParamsTest() {
+        RandomCharsTable randomCharsTable = new RandomCharsTable();
+        String input = "number1 number2 even";
+        setInput(input);
+        randomCharsTable.run();
+        printOut();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void thirdParamIncorrectTest() {
+        RandomCharsTable randomCharsTable = new RandomCharsTable();
+        String input = "1 2 noEven";
+        setInput(input);
+        randomCharsTable.run();
+        printOut();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void correctParams1Test() {
+        RandomCharsTable randomCharsTable = new RandomCharsTable();
+        String input = "1 2 even";
+        setInput(input);
+        randomCharsTable.run();
+        printOut();
+        Assertions.assertEquals(2, getOutputLines().length);
+    }
+
+    @Test
+    public void correctParams2Test() {
+        RandomCharsTable randomCharsTable = new RandomCharsTable();
+        String input = "4 5 even";
+        setInput(input);
+        randomCharsTable.run();
+        printOut();
+        Assertions.assertEquals(5, getOutputLines().length);
+    }
+}
diff --git a/src/test/java/homework_2/traffic_light/TrafficLightTest.java b/src/test/java/homework_2/traffic_light/TrafficLightTest.java
new file mode 100644
index 00000000..57d6f430
--- /dev/null
+++ b/src/test/java/homework_2/traffic_light/TrafficLightTest.java
@@ -0,0 +1,58 @@
+package homework_2.traffic_light;
+
+import base.UnitBase;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class TrafficLightTest extends UnitBase {
+
+    public static final String ERROR_MESSAGE = "Only 1 non-negative integer is allowed as passed parameter";
+    public static final String DAY_OVER = "The day is over";
+
+    @Test
+    public void negativeParamTest() {
+        TrafficLight trafficLight = new TrafficLight();
+        setInput("-1");
+        trafficLight.run();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void notNumberParamTest() {
+        TrafficLight trafficLight = new TrafficLight();
+        setInput("number");
+        trafficLight.run();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void tooLargeNumberParamTest() {
+        TrafficLight trafficLight = new TrafficLight();
+        setInput("86400");
+        trafficLight.run();
+        Assertions.assertEquals(DAY_OVER, getOutputLines()[0]);
+    }
+
+    @ParameterizedTest
+    @MethodSource("testCases")
+    public void correctParam1Test(String input,  String expected) {
+        TrafficLight trafficLight = new TrafficLight();
+        setInput(input);
+        trafficLight.run();
+        Assertions.assertEquals(expected, getOutputLines()[0]);
+    }
+
+    public static Stream<Arguments> testCases() {
+        return Stream.of(
+                Arguments.of("0", "Green"),
+                Arguments.of("1", "Green"),
+                Arguments.of("35", "Yellow"),
+                Arguments.of("54", "Red")
+        );
+
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/homework_3/ImmutableClassTest.java b/src/test/java/homework_3/ImmutableClassTest.java
new file mode 100644
index 00000000..0ec43a89
--- /dev/null
+++ b/src/test/java/homework_3/ImmutableClassTest.java
@@ -0,0 +1,23 @@
+package homework_3;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class ImmutableClassTest {
+
+    @Test
+    public void immutableClassTest() {
+        ImmutableClass immutableClass = new ImmutableClass(21, 25, 6, "Vasya");
+        ImmutableClass immutableClassAge = immutableClass.changeAge(2);
+        ImmutableClass immutableClassName = immutableClass.changeName("neVasya");
+        ImmutableClass immutableClassHigh = immutableClass.changeWeightAndHigh(2, 22);
+
+        Assertions.assertNotSame(immutableClass, immutableClassAge);
+        Assertions.assertNotSame(immutableClass, immutableClassHigh);
+        Assertions.assertNotSame(immutableClass, immutableClassName);
+
+        Assertions.assertNotEquals(immutableClass, immutableClassAge);
+        Assertions.assertNotEquals(immutableClass, immutableClassName);
+        Assertions.assertNotEquals(immutableClass, immutableClassHigh);
+    }
+}
diff --git a/src/test/java/homework_4/custom_annotation/CustomAnnotationTest.java b/src/test/java/homework_4/custom_annotation/CustomAnnotationTest.java
new file mode 100644
index 00000000..9ab8af33
--- /dev/null
+++ b/src/test/java/homework_4/custom_annotation/CustomAnnotationTest.java
@@ -0,0 +1,129 @@
+package homework_4.custom_annotation;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class CustomAnnotationTest {
+
+    @Test
+    public void defaultValueFieldIntegerTest() {
+        class TestClass {
+            @DefaultValue("21")
+            private Integer integerValue1;
+
+            @DefaultValue("21")
+            private int integerValue2;
+
+            public Integer getIntegerValue1() {
+                return integerValue1;
+            }
+
+            public int getIntegerValue2() {
+                return integerValue2;
+            }
+        }
+        TestClass testClass = new TestClass();
+        try {
+            DefaulValueImpl.insetDefaultValue(testClass);
+            Assertions.assertEquals(21, testClass.getIntegerValue1());
+            Assertions.assertEquals(21, testClass.getIntegerValue2());
+        } catch (Exception ignore) {
+        }
+    }
+
+    @Test
+    public void defaultValueFieldDoubleTest() {
+        class TestClass {
+            @DefaultValue("21.2")
+            private Double doubleValue1;
+
+            @DefaultValue("21.3")
+            private double doubleValue2;
+
+            public Double getDoubleValue1() {
+                return doubleValue1;
+            }
+
+            public double getDoubleValue2() {
+                return doubleValue2;
+            }
+        }
+        TestClass testClass = new TestClass();
+        try {
+            DefaulValueImpl.insetDefaultValue(testClass);
+            Assertions.assertEquals(21.2, testClass.getDoubleValue1());
+            Assertions.assertEquals(21.3, testClass.getDoubleValue2());
+        } catch (Exception ignore) {
+        }
+    }
+
+    @Test
+    public void defaultValueFieldStringTest() {
+        class TestClass {
+            @DefaultValue("value1")
+            private String stringValue1;
+
+            @DefaultValue("anotherValue")
+            private String stringValue2;
+
+            public String getStringValue1() {
+                return stringValue1;
+            }
+
+            public String getStringValue2() {
+                return stringValue2;
+            }
+        }
+        TestClass testClass = new TestClass();
+        try {
+            DefaulValueImpl.insetDefaultValue(testClass);
+            Assertions.assertEquals("value1", testClass.getStringValue1());
+            Assertions.assertEquals("anotherValue", testClass.getStringValue2());
+        } catch (Exception ignore) {
+        }
+    }
+
+    @Test
+    public void defaultValueMethodIntegerParamTest() {
+        class TestClass {
+            private Integer integer;
+            private Double value;
+            private String str;
+
+            @DefaultValue("11")
+            public void setInteger(Integer integer) {
+                this.integer = integer;
+            }
+
+            @DefaultValue("12.3")
+            public void setValue(Double value) {
+                this.value = value;
+            }
+
+            @DefaultValue("string")
+            public void setStr(String str) {
+                this.str = str;
+            }
+
+            public Integer getInteger() {
+                return integer;
+            }
+
+            public Double getDouble() {
+                return value;
+            }
+
+            public String getString() {
+                return str;
+            }
+        }
+        TestClass testClass = new TestClass();
+        try {
+            DefaulValueImpl.insetDefaultValue(testClass);
+            Assertions.assertEquals(11, testClass.getInteger());
+            Assertions.assertEquals(12.3, testClass.getDouble());
+            Assertions.assertEquals("string", testClass.getString());
+        } catch (Exception ignore) {
+        }
+    }
+}
diff --git a/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java b/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
new file mode 100644
index 00000000..5c9918f4
--- /dev/null
+++ b/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
@@ -0,0 +1,34 @@
+package homework_4.custom_file_reader;
+
+import base.UnitBase;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class CustomFileReaderTest extends UnitBase {
+
+    static final String EXPECTED_VALUE = "awdwadawdaawdawawdawdawdawdawdawdawdawdawdawdawdawdawdawdawda";
+
+    @Test
+    public void utilReaderTest() {
+        CustomFileReader customFileReader = new CustomFileReader();
+        customFileReader.run1();
+        printOut();
+        Assertions.assertEquals(EXPECTED_VALUE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void nioReaderTest() {
+        CustomFileReader customFileReader = new CustomFileReader();
+        customFileReader.run2();
+        printOut();
+        Assertions.assertEquals(EXPECTED_VALUE, getOutputLines()[0]);
+    }
+
+    @Test
+    public void ioReaderTest() {
+        CustomFileReader customFileReader = new CustomFileReader();
+        customFileReader.run3();
+        printOut();
+        Assertions.assertEquals(EXPECTED_VALUE, getOutputLines()[0]);
+    }
+}
diff --git a/src/test/java/homework_4/singleton/SingletonTest.java b/src/test/java/homework_4/singleton/SingletonTest.java
new file mode 100644
index 00000000..f1bc9d67
--- /dev/null
+++ b/src/test/java/homework_4/singleton/SingletonTest.java
@@ -0,0 +1,15 @@
+package homework_4.singleton;
+
+import homework_4.singleton.Singleton;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class SingletonTest {
+
+    @Test
+    public void equalsLinkTest() {
+        Singleton singleton1 = Singleton.getInstance();
+        Singleton singleton2 = Singleton.getInstance();
+        Assertions.assertSame(singleton1, singleton2);
+    }
+}

From 2c248d5a286456c78a6371c617d628eb46c354a7 Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Mon, 9 Aug 2021 21:42:49 +0300
Subject: [PATCH 19/20] Rework test to custom file reader

---
 src/main/resources/custom_file_reader/input.txt                 | 2 +-
 .../homework_4/custom_file_reader/CustomFileReaderTest.java     | 2 +-
 src/test/java/homework_4/singleton/SingletonTest.java           | 1 -
 3 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/main/resources/custom_file_reader/input.txt b/src/main/resources/custom_file_reader/input.txt
index 4abee03a..fd384710 100644
--- a/src/main/resources/custom_file_reader/input.txt
+++ b/src/main/resources/custom_file_reader/input.txt
@@ -1 +1 @@
-awdwadawda.awdaw,awdawdawd,awd,awd,awd,aw,da.wd.aw.da.wd.awd.aw.dawd,aw,da.wd,a.
\ No newline at end of file
+The text, in a way, consists of a number of sentences. One sentence, even a very widespread, complex one, cannot be called a text, since the text can be divided into independent sentences, and parts of the sentence are combined according to the laws of the syntax of a complex sentence, but not the text.
\ No newline at end of file
diff --git a/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java b/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
index 5c9918f4..1df28649 100644
--- a/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
+++ b/src/test/java/homework_4/custom_file_reader/CustomFileReaderTest.java
@@ -6,7 +6,7 @@
 
 public class CustomFileReaderTest extends UnitBase {
 
-    static final String EXPECTED_VALUE = "awdwadawdaawdawawdawdawdawdawdawdawdawdawdawdawdawdawdawdawda";
+    static final String EXPECTED_VALUE = "The text in a way consists of a number of sentences One sentence even a very widespread complex one cannot be called a text since the text can be divided into independent sentences and parts of the sentence are combined according to the laws of the syntax of a complex sentence but not the text";
 
     @Test
     public void utilReaderTest() {
diff --git a/src/test/java/homework_4/singleton/SingletonTest.java b/src/test/java/homework_4/singleton/SingletonTest.java
index f1bc9d67..68b4266f 100644
--- a/src/test/java/homework_4/singleton/SingletonTest.java
+++ b/src/test/java/homework_4/singleton/SingletonTest.java
@@ -1,6 +1,5 @@
 package homework_4.singleton;
 
-import homework_4.singleton.Singleton;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 

From 70a947fd1f4f48af2df3988ae1481264e3e2c86d Mon Sep 17 00:00:00 2001
From: semenantufiev <alexantufiev@gmail.com>
Date: Fri, 20 Aug 2021 00:37:03 +0300
Subject: [PATCH 20/20] Complete homework_5

---
 .../CustomRegexMatcher.java                   | 14 ++++
 .../homework_5/custom_regex_matcher/Main.java |  8 +++
 .../java/homework_5/power_of_number/Main.java |  7 ++
 .../power_of_number/PowerOfNumber.java        | 32 ++++++++++
 .../CustomRegexMatcherTest.java               | 51 +++++++++++++++
 .../power_of_number/PowerOfNumberTest.java    | 64 +++++++++++++++++++
 6 files changed, 176 insertions(+)
 create mode 100644 src/main/java/homework_5/custom_regex_matcher/CustomRegexMatcher.java
 create mode 100644 src/main/java/homework_5/custom_regex_matcher/Main.java
 create mode 100644 src/main/java/homework_5/power_of_number/Main.java
 create mode 100644 src/main/java/homework_5/power_of_number/PowerOfNumber.java
 create mode 100644 src/test/java/homework_5/custom_regex_matchers/CustomRegexMatcherTest.java
 create mode 100644 src/test/java/homework_5/power_of_number/PowerOfNumberTest.java

diff --git a/src/main/java/homework_5/custom_regex_matcher/CustomRegexMatcher.java b/src/main/java/homework_5/custom_regex_matcher/CustomRegexMatcher.java
new file mode 100644
index 00000000..5c6db802
--- /dev/null
+++ b/src/main/java/homework_5/custom_regex_matcher/CustomRegexMatcher.java
@@ -0,0 +1,14 @@
+package homework_5.custom_regex_matcher;
+
+import java.util.Scanner;
+import java.util.regex.Pattern;
+
+public class CustomRegexMatcher {
+
+    private final static String REG_EXP = "^([a-zA-Z0-9])[a-zA-Z0-9._]+@[a-z]+\\.[a-z]*";
+    public boolean run() {
+        Scanner scanner = new Scanner(System.in);
+        String email = scanner.next();
+        return Pattern.matches(REG_EXP, email);
+    }
+}
diff --git a/src/main/java/homework_5/custom_regex_matcher/Main.java b/src/main/java/homework_5/custom_regex_matcher/Main.java
new file mode 100644
index 00000000..0de49777
--- /dev/null
+++ b/src/main/java/homework_5/custom_regex_matcher/Main.java
@@ -0,0 +1,8 @@
+package homework_5.custom_regex_matcher;
+
+public class Main {
+
+    public static void main(String[] args) {
+        System.out.println(new CustomRegexMatcher().run());
+    }
+}
diff --git a/src/main/java/homework_5/power_of_number/Main.java b/src/main/java/homework_5/power_of_number/Main.java
new file mode 100644
index 00000000..930f2040
--- /dev/null
+++ b/src/main/java/homework_5/power_of_number/Main.java
@@ -0,0 +1,7 @@
+package homework_5.power_of_number;
+
+public class Main {
+    public static void main(String[] args) {
+        new PowerOfNumber().run();
+    }
+}
diff --git a/src/main/java/homework_5/power_of_number/PowerOfNumber.java b/src/main/java/homework_5/power_of_number/PowerOfNumber.java
new file mode 100644
index 00000000..3426a6a9
--- /dev/null
+++ b/src/main/java/homework_5/power_of_number/PowerOfNumber.java
@@ -0,0 +1,32 @@
+package homework_5.power_of_number;
+
+import java.util.Scanner;
+import java.util.regex.Pattern;
+
+public class PowerOfNumber {
+    private static final String ERROR_MESSAGE = "any problem with input (negative, less/more arguments, string) output: Only 2 non-negative integers are allowed";
+
+    public void run() {
+        Scanner scanner = new Scanner(System.in);
+        String number =  scanner.next();
+        String power = scanner.next();
+        if (number == null || isNotNumber(number) || power == null || isNotNumber(power)) {
+            System.out.println(ERROR_MESSAGE);
+            return;
+        }
+        int integer = Integer.parseInt(number);
+        int intPower = Integer.parseInt(power);
+        System.out.println(recursivePower(integer, intPower));
+    }
+
+    private boolean isNotNumber(String str) {
+        return !Pattern.matches("[0-9]+", str);
+    }
+
+    public int recursivePower(int number, int power) {
+        if (power == 0) {
+            return 1;
+        }
+        return number * recursivePower(number, --power);
+    }
+}
diff --git a/src/test/java/homework_5/custom_regex_matchers/CustomRegexMatcherTest.java b/src/test/java/homework_5/custom_regex_matchers/CustomRegexMatcherTest.java
new file mode 100644
index 00000000..9547a7bb
--- /dev/null
+++ b/src/test/java/homework_5/custom_regex_matchers/CustomRegexMatcherTest.java
@@ -0,0 +1,51 @@
+package homework_5.custom_regex_matchers;
+
+import base.UnitBase;
+import homework_5.custom_regex_matcher.CustomRegexMatcher;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class CustomRegexMatcherTest extends UnitBase {
+
+    @ParameterizedTest
+    @MethodSource("testCasesIncorrect")
+    public void checkIncorrectEmails(String email) {
+        setInput(email);
+        CustomRegexMatcher customRegexMatcher = new CustomRegexMatcher();
+        Assertions.assertFalse(customRegexMatcher.run());
+    }
+
+    public static Stream<Arguments> testCasesIncorrect() {
+        return Stream.of(
+                Arguments.of("_awdawd@mail.ru"),
+                Arguments.of("awdawmail.ru"),
+                Arguments.of("adwawd@.ru"),
+                Arguments.of("awdawdw@"),
+                Arguments.of("awdawdw@mail"),
+                Arguments.of("awdawdw@ru"),
+                Arguments.of("awdawdw@."),
+                Arguments.of("awdawdw@awda_ru")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("testCasesCorrect")
+    public void checkCorrectEmails(String email) {
+        setInput(email);
+        CustomRegexMatcher customRegexMatcher = new CustomRegexMatcher();
+        Assertions.assertTrue(customRegexMatcher.run());
+    }
+
+    public static Stream<Arguments> testCasesCorrect() {
+        return Stream.of(
+                Arguments.of("awdawd@mail.ru"),
+                Arguments.of("awdaw@tinkof.com"),
+                Arguments.of("2.adwawd@group.ru"),
+                Arguments.of("2_adwawd@group.ru"),
+                Arguments.of("awda.213wdw@mail.net")
+        );
+    }
+}
diff --git a/src/test/java/homework_5/power_of_number/PowerOfNumberTest.java b/src/test/java/homework_5/power_of_number/PowerOfNumberTest.java
new file mode 100644
index 00000000..28e2ba50
--- /dev/null
+++ b/src/test/java/homework_5/power_of_number/PowerOfNumberTest.java
@@ -0,0 +1,64 @@
+package homework_5.power_of_number;
+
+import base.UnitBase;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class PowerOfNumberTest extends UnitBase {
+
+    private static final String ERROR_MESSAGE = "any problem with input (negative, less/more arguments, string) output: Only 2 non-negative integers are allowed";
+
+    @ParameterizedTest
+    @MethodSource("notNumberCase")
+    public void paramsNotNumberTest(String firstParam, String secondParam) {
+        setInput(firstParam + " " + secondParam);
+        printOut();
+        new PowerOfNumber().run();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    public static Stream<Arguments> notNumberCase() {
+        return Stream.of(
+                Arguments.of("string", "1"),
+                Arguments.of("1", "string"),
+                Arguments.of("string", "string")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("nullParamsCase")
+    public void paramsNullTest(String firstParam, String secondParam) {
+        setInput(firstParam + " " + secondParam);
+        printOut();
+        new PowerOfNumber().run();
+        Assertions.assertEquals(ERROR_MESSAGE, getOutputLines()[0]);
+    }
+
+    public static Stream<Arguments> nullParamsCase() {
+        return Stream.of(
+                Arguments.of("1", null),
+                Arguments.of(null, "string"),
+                Arguments.of(null, null)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("correctValueCase")
+    public void correctValueTest(String firstParam, String secondParam, String expected) {
+        setInput(firstParam + " " + secondParam);
+        printOut();
+        new PowerOfNumber().run();
+        Assertions.assertEquals(expected, getOutputLines()[0]);
+    }
+
+    public static Stream<Arguments> correctValueCase() {
+        return Stream.of(
+                Arguments.of("1", "2", "1"),
+                Arguments.of("2", "2", "4"),
+                Arguments.of("5", "5", "3125")
+        );
+    }
+}