package map;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

public class MapTest2

{

public static void main(String[] args)

{

Map m = new HashMap();

Person p1 = new Person();

Person p2 = new Person();

p1.setId("1");

p1.setName("name1");

p2.setId("2"); //注意这里设置了不同的ID

p2.setName("name2");

m.put(p1, "person1");

m.put(p2, "person2");

System.out.println("Map m's size :" + m.size());

p2.setId("1");

System.out.println("Map m's size :" + m.size());

for(Object o :m.entrySet())

{

Entry e = (Entry)o;

System.out.println("key:"+ e.getKey());

System.out.println("value:"+ e.getValue());

}

}

}