hasshmap输出value

 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
 
 public class zengzhiwei {
     public static void main(String agrs[]) {
         System.out.println("hello world!");
         Map<String, String> m = new HashMap<String, String>();
         m.put("zengzhiwei", "zzw");
         m.put("zengzhijie", "zzj");
 
         Set<String> s = m.keySet();
         Iterator<String> itr = s.iterator();
         while(itr.hasNext()) {
             Object o = itr.next();
             System.out.println(m.get(o));
         }
 
     }
 
 }