Add the necessary fields, classes, implement all methods

src/main/java/com/epam/izh/rd/online/entity/Author.java

@@ -19,5 +19,73 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class Author {
+private String name;
+private String lastName;
+private LocalDate birthdate;
+private String country;
 
+    public Author() {
+    }
+
+    public Author(String name, String lastName, LocalDate birthdate, String country) {
+        this.name = name;
+        this.lastName = lastName;
+        this.birthdate = birthdate;
+        this.country = country;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setBirthdate(LocalDate birthdate) {
+        this.birthdate = birthdate;
+    }
+
+    public LocalDate getBirthdate() {
+        return birthdate;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Author)) return false;
+        Author author = (Author) o;
+        return Objects.equals(getName(), author.getName()) && Objects.equals(getLastName(), author.getLastName()) && Objects.equals(getBirthdate(), author.getBirthdate()) && Objects.equals(getCountry(), author.getCountry());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(getName(), getLastName(), getBirthdate(), getCountry());
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "name='" + name + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", birthDate=" + birthdate +
+                ", country='" + country + '\'' +
+                '}';
+    }
 }

src/main/java/com/epam/izh/rd/online/entity/Book.java

@@ -17,4 +17,51 @@
  */
 public abstract class Book {
 
+    private int numberOfPages;
+    private String name;
+
+    public Book() {
+    }
+
+    public Book(int numberOfPages, String name) {
+        this.numberOfPages = numberOfPages;
+        this.name = name;
+    }
+
+    public void setNumberOfPages(int numberOfPages) {
+        this.numberOfPages = numberOfPages;
+    }
+
+    public int getNumberOfPages() {
+        return numberOfPages;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Book)) return false;
+        Book book = (Book) o;
+        return getNumberOfPages() == book.getNumberOfPages() && Objects.equals(getName(), book.getName());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(getNumberOfPages(), getName());
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "numberOfPages=" + numberOfPages +
+                ", name='" + name + '\'' +
+                '}';
+    }
 }

src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java

@@ -20,5 +20,64 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class SchoolBook extends Book {
+private String authorName;
+private String authorLastName;
+private LocalDate publishDate;
 
+    public SchoolBook() {
+    }
+
+    public SchoolBook(int numberOfPages, String name, String authorName, String authorLastName, LocalDate publishDate) {
+        super(numberOfPages, name);
+        this.authorName = authorName;
+        this.authorLastName = authorLastName;
+        this.publishDate = publishDate;
+    }
+
+    public void setAuthorName(String authorName) {
+        this.authorName = authorName;
+    }
+
+    public String getAuthorName() {
+        return authorName;
+    }
+
+    public void setAuthorLastName(String authorLastName) {
+        this.authorLastName = authorLastName;
+    }
+
+    public String getAuthorLastName() {
+        return authorLastName;
+    }
+
+    public void setPublishDate(LocalDate publishDate) {
+        this.publishDate = publishDate;
+    }
+
+    public LocalDate getPublishDate() {
+        return publishDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof SchoolBook)) return false;
+        if (!super.equals(o)) return false;
+        SchoolBook that = (SchoolBook) o;
+        return getAuthorName().equals(that.getAuthorName()) && getAuthorLastName().equals(that.getAuthorLastName()) && getPublishDate().equals(that.getPublishDate());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), getAuthorName(), getAuthorLastName(), getPublishDate());
+    }
+
+    @Override
+    public String toString() {
+        return "SchoolBook{" +
+                "authorName='" + authorName + '\'' +
+                ", authorLastName='" + authorLastName + '\'' +
+                ", publishDate=" + publishDate +
+                '}';
+    }
 }

src/main/java/com/epam/izh/rd/online/repository/AuthorRepository.java

@@ -57,3 +57,4 @@ public interface AuthorRepository {
      */
     int count();
 }
+