java map集合小练习

package com.hanqi.jihe;

import java.util.*;
public class emplei {
    //先创建emplei类
    //定义类型
    private String eid;
    private String ename;
    
    
    public emplei(String eid,String ename)
    {
        this.eid=eid;
        this.ename=ename;
    }

    public String getEid() {
        return eid;
    }

    public void setEid(String eid) {
        this.eid = eid;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }
    
    
    

}

package com.hanqi.jihe;
import java.util.*;
public class Mapceshi {

    public static void main(String[] args) {
        //创建一个map集合
        Map<String, String> mp = new HashMap<>();
        //创建emplei对象，
        emplei em1 = new emplei("001","1");
        emplei em2 = new emplei("002","2");
        emplei em3 = new emplei("003","3");
        emplei em4 = new emplei("004","4");
        emplei em5 = new emplei("005","5");
        
        //将对象添加到mp集合中
        mp.put(em1.getEid(), em1.getEname());
        mp.put(em2.getEid(), em2.getEname());
        mp.put(em3.getEid(), em3.getEname());
        mp.put(em4.getEid(), em4.getEname());
        mp.put(em5.getEid(), em5.getEname());
        
        //遍历mp集合  
        Set <String> k =mp.keySet();
        for(String i:k)
        {
        
            System.out.println(i+"   "+mp.get(i));
        }

        //移除id为005的对象
        mp.remove("005");
        
        System.out.println();
        
        //迭代器遍历
        Iterator<String> it = k.iterator();
        while(it.hasNext())
        {
            String str = it.next();
            
            System.out.println(str+"  "+mp.get(str));
        }

    }

}