java集合练习：创建Map集合，创建Emp对象，并将创建的Emp对象添加到集合中

Posted 2020-07-16 厂公

package com.jihe;

public class Emp {
    private String e_id;
    private String e_name;
    public Emp(String e_id, String e_name) {
        super();
        this.e_id = e_id;
        this.e_name = e_name;
    }
    public String getE_id() {
        return e_id;
    }
    public void setE_id(String e_id) {
        this.e_id = e_id;
    }
    public String getE_name() {
        return e_name;
    }
    public void setE_name(String e_name) {
        this.e_name = e_name;
    }
    

}

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

    public static void main(String[] args) {
        Map<String,String> map=new HashMap();
        Emp emp=new Emp("001","张三");
        Emp emp1=new Emp("005","李四");
        Emp emp2=new Emp("003","王五");
        Emp emp3=new Emp("008","赵六");
        map.put(emp.getE_id(), emp.getE_name());
        map.put(emp1.getE_id(), emp1.getE_name());
        map.put(emp2.getE_id(), emp2.getE_name());
        map.put(emp3.getE_id(), emp3.getE_name());
        Set<String> keys=map.keySet();
        System.out.println("遍历集合map：");
        Iterator<String> it=keys.iterator();
        while(it.hasNext())
        {
            String key=it.next();
            System.out.println(key+" "+map.get(key));
        }
        System.out.println("移除的是"+map.remove("005"));
        Map<String,String>treemap=new TreeMap();
        treemap.putAll(map);
        Set set=treemap.keySet();
        System.out.println("遍历集合treemap：");
        Iterator<String> ss=set.iterator();
        while(ss.hasNext())
        {
            String str=ss.next();
            System.out.println(str+" "+treemap.get(str));
            
        }

    }

}