Object

class Person{
    private String name ;
    private int age;
    public Person(String name,int age) {
        this.name = name;
        this.age = age;
    }
//    public int hashCode() {
//        return super.hashCode();
//    }
    public int hashCode() {
        return this.age;
    }
    public String toString() {
        return "姓名"+this.name+","+"年龄"+this.age;
    }
                                      //多态 子类对象赋值给父类变量
    public boolean equals(Object obj) {//Object obj = new Person("王强",12);
        Person p = (Person)obj;//向下强转 父类变量 obj 赋值给 子类变量 
        return this.age == p.age;
    }
}
public class Demo1 {
    public static void main(String[] args) {
        Person p1 = new Person("王二",12);
        Person p2 = new Person("王强",12);
        System.out.println(p1);//toString 方法默认是返回包名.类名 @对象的哈希码
        System.out.println(p1.equals(p2));//equals 默认的是放回俩个对象的地址是否相同

        System.out.println(p1.hashCode());
        System.out.println(p2.hashCode());
    }
}