adding hibernate equity

Author: springframeworkguru

src/main/java/guru/springframework/spring6webapp/domain/Author.java

@@ -50,4 +50,40 @@ public String getLastName() {
     public void setLastName(String lastName) {
         this.lastName = lastName;
     }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "id=" + id +
+                ", firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", books=" + books +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Author)) return false;
+
+        Author author = (Author) o;
+
+        return getId() != null ? getId().equals(author.getId()) : author.getId() == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return getId() != null ? getId().hashCode() : 0;
+    }
 }
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src/main/java/guru/springframework/spring6webapp/domain/Book.java

@@ -52,4 +52,37 @@ public String getIsbn() {
     public void setIsbn(String isbn) {
         this.isbn = isbn;
     }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", isbn='" + isbn + '\'' +
+                ", authors=" + authors +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Book)) return false;
+
+        Book book = (Book) o;
+
+        return getId() != null ? getId().equals(book.getId()) : book.getId() == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return getId() != null ? getId().hashCode() : 0;
+    }
 }
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