diff --git a/inflearn/design-pattern/build.gradle b/inflearn/design-pattern/build.gradle
new file mode 100644
index 0000000..3cae2d7
--- /dev/null
+++ b/inflearn/design-pattern/build.gradle
@@ -0,0 +1,19 @@
+plugins {
+    id 'java'
+}
+
+group 'org.example'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.jar b/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..7454180
Binary files /dev/null and b/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.properties b/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..69a9715
--- /dev/null
+++ b/inflearn/design-pattern/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/inflearn/design-pattern/gradlew b/inflearn/design-pattern/gradlew
new file mode 100755
index 0000000..744e882
--- /dev/null
+++ b/inflearn/design-pattern/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/inflearn/design-pattern/gradlew.bat b/inflearn/design-pattern/gradlew.bat
new file mode 100644
index 0000000..ac1b06f
--- /dev/null
+++ b/inflearn/design-pattern/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/inflearn/design-pattern/settings.gradle b/inflearn/design-pattern/settings.gradle
new file mode 100644
index 0000000..1a120d6
--- /dev/null
+++ b/inflearn/design-pattern/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'design-pattern'
+
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/Anchor.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Anchor.java
new file mode 100644
index 0000000..349beae
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Anchor.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public interface Anchor {
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/Client.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Client.java
new file mode 100644
index 0000000..da875cc
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Client.java
@@ -0,0 +1,20 @@
+package abstract_factorymethod;
+
+import factorymethod.Ship;
+import factorymethod.WhiteShip;
+
+public class Client extends DefaultShipFactory{
+    private ShipPartsFactory shipPartsFactory;
+
+    public Client(ShipPartsFactory shipPartsFactory) {
+        this.shipPartsFactory = shipPartsFactory;
+    }
+
+    @Override
+    Ship createShip() {
+        WhiteShip ship = new WhiteShip();
+        ship.setAnchor(shipPartsFactory.createAnchor());
+        ship.setWheel(shipPartsFactory.createWheel());
+        return ship;
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/DefaultShipFactory.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/DefaultShipFactory.java
new file mode 100644
index 0000000..48f8fc8
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/DefaultShipFactory.java
@@ -0,0 +1,34 @@
+package abstract_factorymethod;
+
+import factorymethod.Ship;
+import factorymethod.ShipFactory;
+
+public abstract class DefaultShipFactory {
+    Ship orderShip(String name, String email) {
+        validate(name, email);
+        prepareFor(name);
+        Ship ship = createShip();
+        sendEmailTo(email, ship);
+        return ship;
+    }
+
+    abstract Ship createShip();
+    private void sendEmailTo(String email, Ship ship) {
+        System.out.println(ship.getName() + "만들어졌습니다.");
+        System.out.println(email + "에게 " + ship.getName() + "이 완성됐음을 이메일로 알림을 보냈습니다.");
+    }
+
+    private void validate(String name, String email) {
+        if(name == null || name.isBlank()) {
+            throw new IllegalArgumentException("배 이름을 지어주세요.");
+        }
+
+        if(email == null || email.isBlank()) {
+            throw new IllegalArgumentException("연락처를 남겨주세요.");
+        }
+    }
+
+    private static void prepareFor(String name) {
+        System.out.println(name + "만들 준비 중..");
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipInventory.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipInventory.java
new file mode 100644
index 0000000..19a9e65
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipInventory.java
@@ -0,0 +1,15 @@
+package abstract_factorymethod;
+
+
+import factorymethod.Ship;
+import factorymethod.ShipFactory;
+import factorymethod.WhiteShipFactory;
+
+public class ShipInventory {
+    public static void main(String[] args) {
+        ShipFactory shipFactory = new WhiteShipFactory(new WhitePartsProFactory());
+        Ship ship = shipFactory.createShip();
+        System.out.println(ship.getAnchor().getClass());
+        System.out.println(ship.getWheel().getClass());
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipPartsFactory.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipPartsFactory.java
new file mode 100644
index 0000000..baa9817
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/ShipPartsFactory.java
@@ -0,0 +1,7 @@
+package abstract_factorymethod;
+
+// 추상 팩토리
+public interface ShipPartsFactory {
+    Anchor createAnchor();
+    Wheel createWheel();
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/Wheel.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Wheel.java
new file mode 100644
index 0000000..fbc9584
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/Wheel.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public interface Wheel {
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchor.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchor.java
new file mode 100644
index 0000000..d630b88
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchor.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public class WhiteAnchor implements Anchor {
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchorPro.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchorPro.java
new file mode 100644
index 0000000..3adbb44
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteAnchorPro.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public class WhiteAnchorPro implements Anchor{
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhitePartsProFactory.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhitePartsProFactory.java
new file mode 100644
index 0000000..292e300
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhitePartsProFactory.java
@@ -0,0 +1,13 @@
+package abstract_factorymethod;
+
+public class WhitePartsProFactory implements ShipPartsFactory {
+    @Override
+    public Anchor createAnchor() {
+        return new WhiteAnchorPro();
+    }
+
+    @Override
+    public Wheel createWheel() {
+        return new WhiteWheelPro();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShip.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShip.java
new file mode 100644
index 0000000..1eb1266
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShip.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public class WhiteShip {
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShipPartsFactory.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShipPartsFactory.java
new file mode 100644
index 0000000..0bcd655
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteShipPartsFactory.java
@@ -0,0 +1,13 @@
+package abstract_factorymethod;
+
+public class WhiteShipPartsFactory implements ShipPartsFactory {
+    @Override
+    public Anchor createAnchor() {
+        return new WhiteAnchor();
+    }
+
+    @Override
+    public Wheel createWheel() {
+        return new WhiteWheel();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheel.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheel.java
new file mode 100644
index 0000000..3874ee8
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheel.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public class WhiteWheel implements Wheel {
+}
diff --git a/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheelPro.java b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheelPro.java
new file mode 100644
index 0000000..382cc9d
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/abstract_factorymethod/WhiteWheelPro.java
@@ -0,0 +1,4 @@
+package abstract_factorymethod;
+
+public class WhiteWheelPro implements Wheel {
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/Account.java b/inflearn/design-pattern/src/main/java/adapter/Account.java
new file mode 100644
index 0000000..a92c394
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/Account.java
@@ -0,0 +1,41 @@
+package adapter;
+
+import adapter.security.UserDetails;
+
+public class Account implements UserDetails {
+
+    private String name;
+
+    private String password;
+
+    private String email;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String getUsername() {
+        return this.getName();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/AccountService.java b/inflearn/design-pattern/src/main/java/adapter/AccountService.java
new file mode 100644
index 0000000..84031d6
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/AccountService.java
@@ -0,0 +1,28 @@
+package adapter;
+
+import adapter.security.UserDetails;
+import adapter.security.UserDetailsService;
+
+public class AccountService implements UserDetailsService {
+
+    public Account findAccountByUsername(String username) {
+        Account account = new Account();
+        account.setName(username);
+        account.setPassword(username);
+        account.setEmail(username);
+        return account;
+    }
+
+    public void createNewAccount(Account account) {
+
+    }
+
+    public void updateAccount(Account account) {
+
+    }
+
+    @Override
+    public UserDetails loadUser(String username) {
+        return findAccountByUsername(username);
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/App.java b/inflearn/design-pattern/src/main/java/adapter/App.java
new file mode 100644
index 0000000..1562759
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/App.java
@@ -0,0 +1,12 @@
+package adapter;
+
+import adapter.security.LoginHandler;
+
+public class App {
+    public static void main(String[] args) {
+        AccountService accountService = new AccountService();
+        LoginHandler loginHandler = new LoginHandler(accountService);
+        String login = loginHandler.login("seansin", "seansin");
+        System.out.println(login);
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/security/LoginHandler.java b/inflearn/design-pattern/src/main/java/adapter/security/LoginHandler.java
new file mode 100644
index 0000000..dbd6d2b
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/security/LoginHandler.java
@@ -0,0 +1,20 @@
+package adapter.security;
+
+// 클라이언트 클래스
+public class LoginHandler {
+    UserDetailsService userDetailsService;
+
+    public LoginHandler(UserDetailsService userDetailsService) {
+        this.userDetailsService = userDetailsService;
+    }
+
+    public String login(String username, String password) {
+        // 타겟 인터페이스
+        UserDetails userDetails = userDetailsService.loadUser(username);
+        if (userDetails.getPassword().equals(password)) {
+            return userDetails.getUsername();
+        } else {
+            throw new IllegalArgumentException();
+        }
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/security/UserDetails.java b/inflearn/design-pattern/src/main/java/adapter/security/UserDetails.java
new file mode 100644
index 0000000..8db6e85
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/security/UserDetails.java
@@ -0,0 +1,6 @@
+package adapter.security;
+
+public interface UserDetails {
+    String getPassword();
+    String getUsername();
+}
diff --git a/inflearn/design-pattern/src/main/java/adapter/security/UserDetailsService.java b/inflearn/design-pattern/src/main/java/adapter/security/UserDetailsService.java
new file mode 100644
index 0000000..d2d99e9
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/adapter/security/UserDetailsService.java
@@ -0,0 +1,5 @@
+package adapter.security;
+
+public interface UserDetailsService {
+    UserDetails loadUser(String username);
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/App.java b/inflearn/design-pattern/src/main/java/bridge/App.java
new file mode 100644
index 0000000..c3e6141
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/App.java
@@ -0,0 +1,16 @@
+package bridge;
+
+public class App {
+    public static void main(String[] args) {
+        Champion kda = new 아리(new KDA());
+        kda.skillQ();
+        kda.skillW();
+
+        // 클라이언트는 Champion (추상적인) 클래스를 사용하고 있다.
+        // new 아리(new PoolParty()) 이 부분은 의존성 주입하는 방식으로 감출 수 있다.
+        // 따라서, 구체적인 클래스를 사용하는 것은 아니다.
+        Champion poolParty = new 아리(new PoolParty());
+        poolParty.skillW();
+        poolParty.move();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/Champion.java b/inflearn/design-pattern/src/main/java/bridge/Champion.java
new file mode 100644
index 0000000..9ec1c7f
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/Champion.java
@@ -0,0 +1,13 @@
+package bridge;
+
+public interface Champion {
+    void move();
+
+    void skillQ();
+
+    void skillW();
+
+    void skillE();
+
+    void skillR();
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/DefaultChampion.java b/inflearn/design-pattern/src/main/java/bridge/DefaultChampion.java
new file mode 100644
index 0000000..7344dc5
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/DefaultChampion.java
@@ -0,0 +1,38 @@
+package bridge;
+
+public class DefaultChampion implements Champion {
+
+    private Skin skin;
+
+    private String name;
+
+    public DefaultChampion(Skin skin, String name) {
+        this.skin = skin;
+        this.name = name;
+    }
+
+    @Override
+    public void move() {
+        System.out.printf("%s %s move\n", skin.getName(), this.name);
+    }
+
+    @Override
+    public void skillQ() {
+        System.out.printf("%s %s skill Q\n", skin.getName(), this.name);
+    }
+
+    @Override
+    public void skillW() {
+        System.out.printf("%s %s skill W\n", skin.getName(), this.name);
+    }
+
+    @Override
+    public void skillE() {
+        System.out.printf("%s %s skill E\n", skin.getName(), this.name);
+    }
+
+    @Override
+    public void skillR() {
+        System.out.printf("%s %s skill R\n", skin.getName(), this.name);
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/KDA.java b/inflearn/design-pattern/src/main/java/bridge/KDA.java
new file mode 100644
index 0000000..c66a780
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/KDA.java
@@ -0,0 +1,8 @@
+package bridge;
+
+public class KDA implements Skin {
+    @Override
+    public String getName() {
+        return "KDA";
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/PoolParty.java b/inflearn/design-pattern/src/main/java/bridge/PoolParty.java
new file mode 100644
index 0000000..4a16dcc
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/PoolParty.java
@@ -0,0 +1,8 @@
+package bridge;
+
+public class PoolParty implements Skin {
+    @Override
+    public String getName() {
+        return "PoolParty";
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/bridge/Skin.java b/inflearn/design-pattern/src/main/java/bridge/Skin.java
new file mode 100644
index 0000000..3e3ff7b
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/bridge/Skin.java
@@ -0,0 +1,5 @@
+package bridge;
+
+public interface Skin {
+    String getName();
+}
diff --git "a/inflearn/design-pattern/src/main/java/bridge/\354\225\204\353\246\254.java" "b/inflearn/design-pattern/src/main/java/bridge/\354\225\204\353\246\254.java"
new file mode 100644
index 0000000..0e4a8ec
--- /dev/null
+++ "b/inflearn/design-pattern/src/main/java/bridge/\354\225\204\353\246\254.java"
@@ -0,0 +1,8 @@
+package bridge;
+
+public class 아리 extends DefaultChampion {
+
+    public 아리(Skin skin) {
+        super(skin, "아리");
+    }
+}
diff --git "a/inflearn/design-pattern/src/main/java/bridge/\354\225\204\354\271\274\353\246\254.java" "b/inflearn/design-pattern/src/main/java/bridge/\354\225\204\354\271\274\353\246\254.java"
new file mode 100644
index 0000000..3aefee2
--- /dev/null
+++ "b/inflearn/design-pattern/src/main/java/bridge/\354\225\204\354\271\274\353\246\254.java"
@@ -0,0 +1,7 @@
+package bridge;
+
+public class 아칼리 extends DefaultChampion {
+    public 아칼리(Skin skin) {
+        super(skin, "아칼리");
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/App.java b/inflearn/design-pattern/src/main/java/builder/App.java
new file mode 100644
index 0000000..8166098
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/App.java
@@ -0,0 +1,11 @@
+package builder;
+
+import java.time.LocalDate;
+
+public class App {
+    public static void main(String[] args) {
+        TourDirector tourDirector = new TourDirector(new DefaultTourBuilder());
+        TourPlan tourPlan = tourDirector.cancunTrip();
+        TourPlan tourPlan1 = tourDirector.shortTrip();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/DefaultTourBuilder.java b/inflearn/design-pattern/src/main/java/builder/DefaultTourBuilder.java
new file mode 100644
index 0000000..841d672
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/DefaultTourBuilder.java
@@ -0,0 +1,55 @@
+package builder;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DefaultTourBuilder implements TourPlanBuilder{
+    private String title;
+
+    private int nights;
+
+    private int days;
+
+    private LocalDate startAt;
+
+    private String whereToStay;
+
+    private final List<DetailPlan> plans = new ArrayList<>();
+
+    @Override
+    public TourPlanBuilder title(String title) {
+        this.title = title;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder nightsAndDays(int nights, int days) {
+        this.nights = nights;
+        this.days = days;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder startAt(LocalDate startAt) {
+        this.startAt = startAt;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder whereToStay(String whereToStay) {
+        this.whereToStay = whereToStay;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder addPlan(int day, String plan) {
+        this.plans.add(new DetailPlan(day, plan));
+        return this;
+    }
+
+    @Override
+    public TourPlan getPlan() {
+        return new TourPlan(title, nights, days, startAt, whereToStay, plans);
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/DetailPlan.java b/inflearn/design-pattern/src/main/java/builder/DetailPlan.java
new file mode 100644
index 0000000..954f89c
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/DetailPlan.java
@@ -0,0 +1,35 @@
+package builder;
+
+public class DetailPlan {
+    private int day;
+    private String plan;
+
+    public DetailPlan(int day, String plan) {
+        this.day = day;
+        this.plan = plan;
+    }
+
+    public int getDay() {
+        return day;
+    }
+
+    public void setDay(int day) {
+        this.day = day;
+    }
+
+    public String getPlan() {
+        return plan;
+    }
+
+    public void setPlan(String plan) {
+        this.plan = plan;
+    }
+
+    @Override
+    public String toString() {
+        return "DetailPlan{" +
+                "day=" + day +
+                ", plan='" + plan + '\'' +
+                '}';
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/TourDirector.java b/inflearn/design-pattern/src/main/java/builder/TourDirector.java
new file mode 100644
index 0000000..85e7778
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/TourDirector.java
@@ -0,0 +1,27 @@
+package builder;
+
+import java.time.LocalDate;
+
+public class TourDirector {
+    private TourPlanBuilder builder;
+
+    public TourDirector(TourPlanBuilder builder) {
+        this.builder = builder;
+    }
+
+    public TourPlan cancunTrip() {
+        return builder.title("칸쿤 여행")
+                .nightsAndDays(2, 3)
+                .startAt(LocalDate.of(2020, 12, 9))
+                .whereToStay("리조트")
+                .addPlan(0, "체크인하고 짐 풀기")
+                .addPlan(0, "저녁 식사")
+                .getPlan();
+    }
+
+    public TourPlan shortTrip() {
+        return builder.title("오레곤 롱비치")
+                .startAt(LocalDate.of(2021, 7, 15))
+                .getPlan();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/TourPlan.java b/inflearn/design-pattern/src/main/java/builder/TourPlan.java
new file mode 100644
index 0000000..9c77f13
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/TourPlan.java
@@ -0,0 +1,91 @@
+package builder;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TourPlan {
+    private String title;
+    private int nights;
+    private int days;
+    private LocalDate startAt;
+    private String whereToStay;
+    private List<DetailPlan> plans = new ArrayList<>();
+
+    public TourPlan() {
+
+    }
+
+    public TourPlan(String title, int nights, int days, LocalDate startAt, String whereToStay, List<DetailPlan> plans) {
+        this.title = title;
+        this.nights = nights;
+        this.days = days;
+        this.startAt = startAt;
+        this.whereToStay = whereToStay;
+        this.plans = plans;
+    }
+
+    public void addPlan(int day, String plan) {
+        this.plans.add(new DetailPlan(day, plan));
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public int getNights() {
+        return nights;
+    }
+
+    public void setNights(int nights) {
+        this.nights = nights;
+    }
+
+    public int getDays() {
+        return days;
+    }
+
+    public void setDays(int days) {
+        this.days = days;
+    }
+
+    public LocalDate getStartAt() {
+        return startAt;
+    }
+
+    public void setStartAt(LocalDate startAt) {
+        this.startAt = startAt;
+    }
+
+    public String getWhereToStay() {
+        return whereToStay;
+    }
+
+    public void setWhereToStay(String whereToStay) {
+        this.whereToStay = whereToStay;
+    }
+
+    public List<DetailPlan> getPlans() {
+        return plans;
+    }
+
+    public void setPlans(List<DetailPlan> plans) {
+        this.plans = plans;
+    }
+
+    @Override
+    public String toString() {
+        return "TourPlan{" +
+                "title='" + title + '\'' +
+                ", nights=" + nights +
+                ", days=" + days +
+                ", startAt=" + startAt +
+                ", whereToStay='" + whereToStay + '\'' +
+                ", plans=" + plans +
+                '}';
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/builder/TourPlanBuilder.java b/inflearn/design-pattern/src/main/java/builder/TourPlanBuilder.java
new file mode 100644
index 0000000..363f347
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/builder/TourPlanBuilder.java
@@ -0,0 +1,12 @@
+package builder;
+
+import java.time.LocalDate;
+
+public interface TourPlanBuilder {
+    TourPlanBuilder title(String title);
+    TourPlanBuilder nightsAndDays(int nights, int days);
+    TourPlanBuilder startAt(LocalDate startAt);
+    TourPlanBuilder whereToStay(String whereToStay);
+    TourPlanBuilder addPlan(int day, String plan);
+    TourPlan getPlan();
+}
diff --git a/inflearn/design-pattern/src/main/java/composite/Bag.java b/inflearn/design-pattern/src/main/java/composite/Bag.java
new file mode 100644
index 0000000..e0c4e35
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/composite/Bag.java
@@ -0,0 +1,24 @@
+package composite;
+
+import java.util.ArrayList;
+import java.util.List;
+
+// Composite 객체이므로 Item을 참조하면 안된다.
+public class Bag implements Component {
+    private final List<Component> components = new ArrayList<>();
+
+    public void add(Component item) {
+        components.add(item);
+    }
+
+    public List<Component> getComponents() {
+        return new ArrayList<>(components);
+    }
+
+    @Override
+    public int getPrice() {
+        return components.stream()
+                .mapToInt(Component::getPrice)
+                .sum();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/composite/Client.java b/inflearn/design-pattern/src/main/java/composite/Client.java
new file mode 100644
index 0000000..644149e
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/composite/Client.java
@@ -0,0 +1,20 @@
+package composite;
+
+public class Client {
+    public static void main(String[] args) {
+        Item doranBlade = new Item("도란검", 450);
+        Item healPotion = new Item("체력 물약", 50);
+
+        Bag bag = new Bag();
+        bag.add(doranBlade);
+        bag.add(healPotion);
+
+        Client client = new Client();
+        client.printPrice(doranBlade);
+        client.printPrice(bag);
+    }
+
+    private void printPrice(Component component) {
+        System.out.println(component.getPrice());
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/composite/Component.java b/inflearn/design-pattern/src/main/java/composite/Component.java
new file mode 100644
index 0000000..89d1dc1
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/composite/Component.java
@@ -0,0 +1,6 @@
+package composite;
+
+// 공통된 오퍼레이션을 제공해야한다.
+public interface Component {
+    int getPrice();
+}
diff --git a/inflearn/design-pattern/src/main/java/composite/Item.java b/inflearn/design-pattern/src/main/java/composite/Item.java
new file mode 100644
index 0000000..9a44bd4
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/composite/Item.java
@@ -0,0 +1,30 @@
+package composite;
+
+public class Item implements Component {
+
+    private String name;
+
+    private int price;
+
+    public Item(String name, int price) {
+        this.name = name;
+        this.price = price;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/BlackShip.java b/inflearn/design-pattern/src/main/java/factorymethod/BlackShip.java
new file mode 100644
index 0000000..2411d8e
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/BlackShip.java
@@ -0,0 +1,9 @@
+package factorymethod;
+
+public class BlackShip extends Ship {
+    public BlackShip() {
+        setName("blackship");
+        setLogo("⚓");
+        setColor("black");
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/BlackShipFactory.java b/inflearn/design-pattern/src/main/java/factorymethod/BlackShipFactory.java
new file mode 100644
index 0000000..ffa2766
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/BlackShipFactory.java
@@ -0,0 +1,8 @@
+package factorymethod;
+
+public class BlackShipFactory implements ShipFactory {
+    @Override
+    public Ship createShip() {
+        return new BlackShip();
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/Client.java b/inflearn/design-pattern/src/main/java/factorymethod/Client.java
new file mode 100644
index 0000000..a3c0806
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/Client.java
@@ -0,0 +1,13 @@
+package factorymethod;
+
+public class Client {
+    public static void main(String[] args) {
+        Client client = new Client();
+//        client.print(new WhiteShipFactory(), "WhiteShip", "workingssu@gmail.com");
+//        client.print(new BlackShipFactory(), "BlackShip", "workingssu@gmail.com");
+    }
+
+    private void print(ShipFactory shipFactory, String name, String email) {
+        System.out.println(shipFactory.orderShip(name, email));
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/Ship.java b/inflearn/design-pattern/src/main/java/factorymethod/Ship.java
new file mode 100644
index 0000000..5d171c6
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/Ship.java
@@ -0,0 +1,55 @@
+package factorymethod;
+
+import abstract_factorymethod.Anchor;
+import abstract_factorymethod.Wheel;
+import abstract_factorymethod.WhiteAnchor;
+import abstract_factorymethod.WhiteWheel;
+
+public class Ship {
+    private String name;
+    private String logo;
+    private String color;
+    private Anchor anchor;
+    private Wheel wheel;
+
+    public String getName() {
+        return name;
+    }
+
+    public Anchor getAnchor() {
+        return anchor;
+    }
+
+    public Wheel getWheel() {
+        return wheel;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setLogo(String logo) {
+        this.logo = logo;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public void setAnchor(Anchor anchor) {
+        this.anchor = anchor;
+    }
+
+    public void setWheel(Wheel wheel) {
+        this.wheel = wheel;
+    }
+
+    @Override
+    public String toString() {
+        return "Ship{" +
+                "name='" + name + '\'' +
+                ", logo='" + logo + '\'' +
+                ", color='" + color + '\'' +
+                '}';
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/ShipFactory.java b/inflearn/design-pattern/src/main/java/factorymethod/ShipFactory.java
new file mode 100644
index 0000000..7b05550
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/ShipFactory.java
@@ -0,0 +1,32 @@
+package factorymethod;
+
+public interface ShipFactory {
+    default Ship orderShip(String name, String email) {
+        validate(name, email);
+        prepareFor(name);
+        Ship ship = createShip();
+        sendEmailTo(email, ship);
+        return ship;
+    }
+
+    Ship createShip();
+
+    private void sendEmailTo(String email, Ship ship) {
+        System.out.println(ship.getName() + "만들어졌습니다.");
+        System.out.println(email + "에게 " + ship.getName() + "이 완성됐음을 이메일로 알림을 보냈습니다.");
+    }
+
+    private void validate(String name, String email) {
+        if(name == null || name.isBlank()) {
+            throw new IllegalArgumentException("배 이름을 지어주세요.");
+        }
+
+        if(email == null || email.isBlank()) {
+            throw new IllegalArgumentException("연락처를 남겨주세요.");
+        }
+    }
+
+    private static void prepareFor(String name) {
+        System.out.println(name + "만들 준비 중..");
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/WhiteShip.java b/inflearn/design-pattern/src/main/java/factorymethod/WhiteShip.java
new file mode 100644
index 0000000..1dd9d67
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/WhiteShip.java
@@ -0,0 +1,9 @@
+package factorymethod;
+
+public class WhiteShip extends Ship{
+    public WhiteShip() {
+        setName("whiteship");
+        setLogo("\uD83D\uDEE5");
+        setColor("white");
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/factorymethod/WhiteShipFactory.java b/inflearn/design-pattern/src/main/java/factorymethod/WhiteShipFactory.java
new file mode 100644
index 0000000..0f2bb69
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/factorymethod/WhiteShipFactory.java
@@ -0,0 +1,19 @@
+package factorymethod;
+
+import abstract_factorymethod.ShipPartsFactory;
+
+public class WhiteShipFactory implements ShipFactory {
+    private final ShipPartsFactory shipPartsFactory;
+
+    public WhiteShipFactory(ShipPartsFactory shipPartsFactory) {
+        this.shipPartsFactory = shipPartsFactory;
+    }
+
+    @Override
+    public Ship createShip() {
+        Ship whiteShip = new WhiteShip();
+        whiteShip.setAnchor(shipPartsFactory.createAnchor());
+        whiteShip.setWheel(shipPartsFactory.createWheel());
+        return whiteShip;
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/prototype/App.java b/inflearn/design-pattern/src/main/java/prototype/App.java
new file mode 100644
index 0000000..561ee65
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/prototype/App.java
@@ -0,0 +1,25 @@
+package prototype;
+
+public class App {
+    public static void main(String[] args) throws CloneNotSupportedException {
+        GithubRepository repository = new GithubRepository();
+        repository.setUser("whiteship");
+        repository.setName("live-study");
+
+        GithubIssue githubIssue = new GithubIssue(repository);
+        githubIssue.setId(1);
+        githubIssue.setTitle("1주차 과제 : JVM은 무엇이며 자바 코드는 어떻게 실행하는 것인가.");
+
+        GithubIssue clone = (GithubIssue) githubIssue.clone();
+
+        repository.setUser("seansin");
+        System.out.println(githubIssue.getUrl());
+        System.out.println(clone.getUrl());
+
+        System.out.println(clone != githubIssue);
+        System.out.println(clone.equals(githubIssue));
+        System.out.println(clone.getClass() == githubIssue.getClass());
+        System.out.println(clone.getGithubRepository() == githubIssue.getGithubRepository());
+
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/prototype/GithubIssue.java b/inflearn/design-pattern/src/main/java/prototype/GithubIssue.java
new file mode 100644
index 0000000..8132c35
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/prototype/GithubIssue.java
@@ -0,0 +1,77 @@
+package prototype;
+
+import java.util.Objects;
+
+public class GithubIssue implements Cloneable {
+    private int id;
+
+    private String title;
+
+    private GithubRepository githubRepository;
+
+    private String url;
+
+    public String getUrl() {
+        return String.format("https://github.com/%s/%s/issues/%d",
+                githubRepository.getUser(),
+                githubRepository.getName(),
+                this.getId());
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public GithubIssue(GithubRepository githubRepository) {
+        this.githubRepository = githubRepository;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public GithubRepository getGithubRepository() {
+        return githubRepository;
+    }
+
+    public void setGithubRepository(GithubRepository githubRepository) {
+        this.githubRepository = githubRepository;
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        GithubRepository repository = new GithubRepository();
+        repository.setUser(this.githubRepository.getUser());
+        repository.setName(this.githubRepository.getName());
+
+        GithubIssue githubIssue = new GithubIssue(repository);
+        githubIssue.setId(this.id);
+        githubIssue.setTitle(this.title);
+        return githubIssue;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        GithubIssue that = (GithubIssue) o;
+        return id == that.id && Objects.equals(title, that.title) && Objects.equals(githubRepository, that.githubRepository) && Objects.equals(url, that.url);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, title, githubRepository, url);
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/prototype/GithubRepository.java b/inflearn/design-pattern/src/main/java/prototype/GithubRepository.java
new file mode 100644
index 0000000..9a135da
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/prototype/GithubRepository.java
@@ -0,0 +1,24 @@
+package prototype;
+
+public class GithubRepository {
+
+    private String user;
+
+    private String name;
+
+    public String getUser() {
+        return user;
+    }
+
+    public void setUser(String user) {
+        this.user = user;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/singletone/App.java b/inflearn/design-pattern/src/main/java/singletone/App.java
new file mode 100644
index 0000000..564daa9
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/singletone/App.java
@@ -0,0 +1,13 @@
+package singletone;
+
+import java.io.*;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+public class App {
+    public static void main(String[] args) throws IOException, ClassNotFoundException {
+        Runtime runtime = Runtime.getRuntime();
+        System.out.println(runtime.maxMemory());
+        System.out.println(runtime.freeMemory());
+    }
+}
diff --git a/inflearn/design-pattern/src/main/java/singletone/Settings.java b/inflearn/design-pattern/src/main/java/singletone/Settings.java
new file mode 100644
index 0000000..4b671ea
--- /dev/null
+++ b/inflearn/design-pattern/src/main/java/singletone/Settings.java
@@ -0,0 +1,16 @@
+package singletone;
+
+import java.io.Serializable;
+
+public class Settings implements Serializable {
+    private Settings() {
+    }
+
+    private static class SettingsHolder {
+        private static final Settings INSTANCE = new Settings();
+    }
+
+    public static Settings getInstance() {
+        return SettingsHolder.INSTANCE;
+    }
+}