/*

* @由于个人水平有限, 难免有些错误, 还请指点:

* @Author: cpu_code

* @Date: 2020-09-17 17:56:43

* @LastEditTime: 2020-09-17 18:07:34

* @FilePath: \java\aggregation\aggregation19.java

* @Gitee: [https://gitee.com/cpu_code](https://gitee.com/cpu_code)

* @Github: [https://github.com/CPU-Code](https://github.com/CPU-Code)

* @CSDN: [https://blog.csdn.net/qq_44226094](https://blog.csdn.net/qq_44226094)

* @Gitbook: [https://923992029.gitbook.io/cpucode/](https://923992029.gitbook.io/cpucode/)

*/

package aggregation;

import java.util.HashMap;

import java.util.Map;

import java.util.Objects;

import java.util.Set;

public class aggregation19 {

public static void main(String[] args) {

//1,创建Hashmap集合对象

Map<Student, String> map = new HashMap<Student, String>();

// 添加元素到集合

map.put(new Student("cpucode", 1), "4");

map.put(new Student("cpu", 2), "5");

map.put(new Student("hello", 3), "6");

//3,取出元素。键找值方式

Set<Student> keySet = map.keySet();

// 遍历得到每一个keySet对象

for (Student key : keySet){

// 解析

String value = map.get(key);

System.out.println(key.toString() + "值是 :" + value);

}

}

static class Student {

private String name;

private int age;

public Student() {

}

public Student(String name, int age){

this.age = age;

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public void setName(String name) {

this.name = name;

}

public String getName() {

return name;

}

@Override

public boolean equals(Object o) {

if(this == o) {

return true;

}

if(o == null || getClass() != o.getClass()){

return false;

}

Student student = (Student) o;

return age == student.age && Objects.equals(name, student.name);

}

@Override

public int hashCode() {

return Objects.hash(name, age);

}

}

}

/*

com.company.Student@1e1c5acd值是 :4

com.company.Student@2eb71b值是 :5

com.company.Student@b73a0532值是 :6

*/