遍历一个Map

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




public class MapTest {
/*
 * 研究遍历一个Map
 */
public static void main(String[] args){
Map<String,String>  m=new HashMap<String,String>();
m.put("a","1");
m.put("b","2");
m.put("c","3");
m.put("d","4");
// System.out.println(m.values());

// System.out.println(m.containsValue("1"));
// System.out.println(m.get("a"));//获取
//遍历Map

Set n=m.keySet();

Iterator it=n.iterator();


while(it.hasNext()){

//System.out.println(it.next().toString());

System.out.println(m.get(it.next().toString()));

}

}
}