HashSet存储自定义类型元素

/*
必须重写hashCode和toString方法
*/
package com.itheima.demo02.Set;

import java.util.HashSet;

/*

HashSet存储自定义类型元素set集合报错元素唯一:    存储的元素(String,Integer,...Student,Person...),必须重写hashCode方法和equals方法要求:    同名同年龄的人,视为同一个人,只能存储一次

*/
public class Demo03HashSetSavePerson {

public static void main(String[] args) {    //创建HashSet集合存储Person    HashSet<Person> set = new HashSet<>();    Person p1 = new Person("小美女",18);    Person p2 = new Person("小美女",18);    Person p3 = new Person("小美女",19);    System.out.println(p1.hashCode());//1967205423    System.out.println(p2.hashCode());//42121758    System.out.println(p1==p2);//false    System.out.println(p1.equals(p2));//false    set.add(p1);    set.add(p2);    set.add(p3);    System.out.println(set);}

}
package com.itheima.demo02.Set;

import java.util.Objects;

public class Person {

private String name;private int age;public Person() {}public Person(String name, int age) {    this.name = name;    this.age = age;}@Overridepublic boolean equals(Object o) {    if (this == o) return true;    if (o == null || getClass() != o.getClass()) return false;    Person person = (Person) o;    return age == person.age &&            Objects.equals(name, person.name);}@Overridepublic int hashCode() {    return Objects.hash(name, age);}@Overridepublic String toString() {    return "Person{" +            "name='" + name + '\'' +            ", age=" + age +            '}';}public String getName() {    return name;}public void setName(String name) {    this.name = name;}public int getAge() {    return age;}public void setAge(int age) {    this.age = age;}

}