java 对象比较

class Book{
    private String title ;
    private double price ;

public Book(String title , double price ){
        this.title = title ;
        this.price = price ;
    }
    public boolean Compare(Book book){
        
        if(this == book )
            return true ;
        if(book == null)
            return false ;
        
        if(this.title.equals(book.title) && this.price == book.price)  //可以直接 访问 私有成员变量
            return true ;
        else
            return false ;
    }
}
public class Test{
    public static void main(String args[]){
        Book b1 = new Book("java",19.9) ;
        Book b2 = new Book("c",19.9) ;
        if(b1.Compare(b1))
            System.out.println("1") ;
        else
            System.out.println("0") ;
        
    }
}