Map 遍历

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

public class MapTest {
	public static void main(String[] args) {
		Map map = new HashMap();
		map.put("1", "gao");
		map.put("2", "zhang");
		map.put("3", "li");
		map.put("4", "wang");

		System.out.println(map);


		//遍历value
		Iterator it = map.values().iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
		System.out.println("--------------------------------");

		//根据key遍历value
		Iterator it2 = map.keySet().iterator();
		while(it2.hasNext()){
			System.out.println(map.get(it2.next()));
		}
		System.out.println("--------------------------------");

		//遍历entry
		Iterator<Map.Entry<String, String>> it3 = map.entrySet().iterator();
		while(it3.hasNext()){
			Map.Entry<String, String> entry = it3.next();
			System.out.println(entry.getKey()+":"+entry.getValue());
		}
	}


}