diff --git a/src/main/java/library/Book.java b/src/main/java/library/Book.java
new file mode 100644
index 0000000..0a1b5f8
--- /dev/null
+++ b/src/main/java/library/Book.java
@@ -0,0 +1,71 @@
+package library;
+
+import java.lang.String;
+import java.util.Objects;
+
+
+public class Book {
+    private String name;
+    private String author;
+    private String genre;
+    private String number;
+
+
+    public Book(String name, String author, String genre, String number) {
+        this.name = name;
+        this.author = author;
+        this.genre = genre;
+        this.number = number;
+    }
+
+    public String toString() {
+        StringBuilder str = new StringBuilder();
+        str.append(name + " ").append(author + " ").append(genre + " ").append(number);
+        return str.toString();
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getGenre() {
+        return genre;
+    }
+
+    public void setGenre(String genre) {
+        this.genre = genre;
+    }
+
+    public String getNumber() {
+        return number;
+    }
+
+    public void setNumber(String number) {
+        this.number = number;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Book book = (Book) o;
+        return Objects.equals(name, book.name) && Objects.equals(author, book.author) && Objects.equals(genre, book.genre) && Objects.equals(number, book.number);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, author, genre, number);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/library/Library.java b/src/main/java/library/Library.java
new file mode 100644
index 0000000..45988d3
--- /dev/null
+++ b/src/main/java/library/Library.java
@@ -0,0 +1,103 @@
+package library;
+
+import java.util.ArrayList;
+import java.util.Objects;
+
+public class Library {
+    private ArrayList<Book> books = new ArrayList();
+
+    public Library(Book... b) {
+        for (int i = 0; i < b.length; i++) {
+            books.add(b[i]);
+        }
+    }
+
+    public void addBook(Book b) {
+        books.add(b);
+    }
+
+    public void deleteBook(Book x) {
+        books.remove(x);
+    }
+
+    public Library searchName(String n) {
+        Library mas = new Library();
+        for (int i = 0; i < books.size(); i++) {
+            String s = books.get(i).getName();
+            if (s.contains(n)) {
+                mas.addBook(books.get(i));
+            }
+        }
+        return mas;
+    }
+
+    public Library searchAuthor(String n) {
+        Library mas = new Library();
+        for (int i = 0; i < books.size(); i++) {
+            String s = books.get(i).getAuthor();
+            if (s.contains(n)) {
+                mas.addBook(books.get(i));
+            }
+        }
+        return mas;
+    }
+
+    public Library searchGenre(String n) {
+        Library mas = new Library();
+        for (int i = 0; i < books.size(); i++) {
+            String s = books.get(i).getGenre();
+            if (s.contains(n)) {
+                mas.addBook(books.get(i));
+            }
+        }
+        return mas;
+    }
+
+    public Library searchNumber(String n) {
+        Library mas = new Library();
+        for (int i = 0; i < books.size(); i++) {
+            String s = books.get(i).getNumber();
+            if (s.contains(n)) {
+                mas.addBook(books.get(i));
+            }
+        }
+        return mas;
+    }
+
+
+    public Library search(String... arr) {
+        Library mas = new Library();
+        ArrayList<String> listArgs = new ArrayList<>();
+        String str = "";
+        int count = 0;
+        for (String a : arr) {
+            listArgs.add(a);
+        }
+        for (int i = 0; i < books.size(); i++) {
+            count = 0;
+            str=books.get(i).getName()+" "+books.get(i).getAuthor()+" "+books.get(i).getGenre()+" "+books.get(i).getNumber();
+            for (int j = 0; j < listArgs.size(); j++) {
+                if (str.contains(listArgs.get(j))) {
+                    count += 1;
+                }
+            }
+            if (listArgs.size() == count) {
+                mas.addBook(books.get(i));
+            }
+        }
+        return mas;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Library library = (Library) o;
+        return Objects.equals(books, library.books);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(books);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/Tests.java b/src/test/java/Tests.java
new file mode 100644
index 0000000..8ffd80a
--- /dev/null
+++ b/src/test/java/Tests.java
@@ -0,0 +1,82 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import library.Book;
+import library.Library;
+import org.junit.jupiter.api.Test;
+
+public class Tests {
+    @Test
+    public void addBook() {
+        Book first = new Book("GG", "Egor", "comedy", "A3");
+        Library expected = new Library(first);
+        Library n = new Library();
+        n.addBook(first);
+        assertEquals(expected, n);
+    }
+
+    @Test
+    public void deleteBook() {
+        Book first = new Book("GG", "Egor", "comedy", "A3");
+        Book second = new Book("Sasha Lukichev", "Egor", "comedy", "A3");
+        Library expected = new Library(second);
+        Library n = new Library(first, second);
+        n.deleteBook(first);
+        assertEquals(expected, n);
+    }
+
+    @Test
+    public void changeBook() {
+        Book expected = new Book("GG", "Egor", "comedy", "A3");
+        Book expected1 = new Book("GG", "Egorka", "comedy", "A3");
+        Book expected2 = new Book("GG", "Egorka", "drama", "A3");
+        Book expected3 = new Book("GG", "Egorka", "drama", "A4");
+        Book n = new Book("Sasha Lukichev", "Egor", "comedy", "A3");
+        n.setName("GG");
+        assertEquals(expected,n);
+        n.setAuthor("Egorka");
+        assertEquals(expected1,n);
+        n.setGenre("drama");
+        assertEquals(expected2,n);
+        n.setNumber("A4");
+        assertEquals(expected3,n);
+    }
+
+    @Test
+    public void findBookNameAndNumber(){
+        Book first = new Book("GG", "Egor", "comedy", "A3");
+        Book second = new Book("Sasha Lukichev", "Egor", "comedy", "A3");
+        Book third = new Book("GG", "Egor", "comedy", "A4");
+        Library lib = new Library(first, second, third);
+        String str = "G";
+        String str1 = "A3";
+        Library expected = new Library(first);
+        Library n = lib.searchName(str).searchNumber(str1);
+        assertEquals(expected,n);
+    }
+
+    @Test
+    public void findBookAuthorAndGenre(){
+        Book first = new Book("GG", "Egor", "comedy", "A3");
+        Book second = new Book("GG", "Egorka", "drama", "A3");
+        Book third = new Book("GG", "Egorka", "comedy", "A4");
+        Library lib = new Library(first, second, third);
+        String str = "Egor";
+        String str1 = "comedy";
+        Library expected = new Library(first,third);
+        Library n = lib.searchAuthor(str).searchGenre(str1);
+        assertEquals(expected,n);
+    }
+
+    @Test
+    public void newFind(){
+        Book first = new Book("GG", "Egor", "comedy", "A3");
+        Book second = new Book("GG", "Egorka", "drama", "A3");
+        Book third = new Book("GG", "Egorka", "comedy", "A4");
+        Library lib = new Library(first, second, third);
+        String str = "Egor";
+        String str1 = "comedy";
+        Library expected = new Library(first,third);
+        Library n = lib.search(str, str1);
+        assertEquals(expected,n);
+    }
+}
\ No newline at end of file