ToString 재정의

아래의 결과 나타나도록 ToString 을 재정의 하시오.

public class ToStringEx {
public static void main (String[] args) {
Book book = new Book(100,"개미");

System.out.println(book);
System.out.println(book.toString());
}

}

public class Book {
  int bookNumber;
  String bookTitle;

  Book (int bookNumber, String bookTitle) {
    this.bookNumber = bookNumber;
    this.bookTitle = bookTitle;
    }
    
  @Override
  public String toString() {
     System.out.println(bookTitle+" "+bookNumber);
       }
    }