Java中HashMap的基本用法

import java.util.HashMap;/** * Created by lx on 2016/10/15. */public class HashMapTest {    public static void main(String[] args) {        HashMap<String ,Student> hashMap=new HashMap<String, Student>();        hashMap.put("1",new Student(001,"Jack"));        hashMap.put("2",new Student(002,"Amy"));        for(String key:hashMap.keySet()){            System.out.println(hashMap.get(key).id);        }    }}