/*

* @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 13:44:31

* @LastEditTime: 2020-09-17 13:47:38

* @FilePath: \java\aggregation\aggregation17.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.Set;

public class aggregation17 {

public static void main(String[] args) {

//创建Map集合对象

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

//添加元素到集合

map.put("cpucode", "1");

map.put("cpu", "2");

map.put("hello", "3");

System.out.println(map);

//获取所有的键 获取键集

Set<String> keys = map.keySet();

// 遍历键集 得到 每一个键

for (String key : keys){

//key 就是键

//获取对应值

String value = map.get(key);

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

}

}

}

/*

{cpucode=1, cpu=2, hello=3}

cpucode的值 :1

cpu的值 :2

hello的值 :3

*/