Object

 1 class Person{
 2     private String name ;
 3     private int age;
 4     public Person(String name,int age) {
 5         this.name = name;
 6         this.age = age;
 7     }
 8 //    public int hashCode() {
 9 //        return super.hashCode();
10 //    }
11     public int hashCode() {
12         return this.age;
13     }
14     public String toString() {
15         return "姓名"+this.name+","+"年龄"+this.age;
16     }
17                                       //多态 子类对象赋值给父类变量
18     public boolean equals(Object obj) {//Object obj = new Person("王强",12);
19         Person p = (Person)obj;//向下强转 父类变量 obj 赋值给 子类变量 
20         return this.age == p.age;
21     }
22 }
23 public class Demo1 {
24     public static void main(String[] args) {
25         Person p1 = new Person("王二",12);
26         Person p2 = new Person("王强",12);
27         System.out.println(p1);//toString 方法默认是返回包名.类名 @对象的哈希码
28         System.out.println(p1.equals(p2));//equals 默认的是放回俩个对象的地址是否相同
29 
30         System.out.println(p1.hashCode());
31         System.out.println(p2.hashCode());
32     }
33 }