package com.example.demo.javaError;import java.util.HashMap;/**
* Created by yyy on 2019/01/24.
*/
public class MyTest {
private static class Person{
int idCard;
String name; public Person(int idCard, String name) {
this.idCard = idCard;
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()){
return false;
}
Person person = (Person) o;
//两个对象是否等值,通过idCard来确定
return this.idCard == person.idCard;
}
@Override
public int hashCode()
{
int hash = 7;
hash = 31*hash+idCard;
// hash = 31*hash+name.hashCode();
return hash; } }
public static void main(String []args){
HashMap<Person,String> map = new HashMap<Person, String>();
Person person = new Person(1234,"乔峰");
//put到hashmap中去
map.put(person,"天龙八部");
//get取出,从逻辑上讲应该能输出“天龙八部”
System.out.println("结果:"+map.get(new Person(1234,"萧峰")));
}
}