testhashmap.java

自己做的一个QQ聊天系统

package test.colletion;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class TestHashMap {
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		 Map map = new HashMap();
		 map.put(Integer.valueOf(1),"tarena");
		 map.put(2,"beijing");
		 map.put(3,"china");
		 System.out.println("集合大小:" +map.size());
         Set keys = map.keySet();
         Iterator it = keys.iterator();
         while(it.hasNext()){
        	 Object o = it.next();
        	 map.get(o);
        	 System.out.println(o + "," + map.get(o));
         }
         Collection c = map.values();
         it = c.iterator();
         while(it.hasNext()){
        	 System.out.println(it.next());
         }
	}

}//同