testhashmap.java

该文件在eclipse环境上运行

package test.collection;
import java.util.*;
public class TestHashMap {

	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();
			System.out.println(o + "," +map.get(o));
		}
		Collection c = map.values();
		it = c.iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
	}
}