java迭代map

java迭代map：
 1 import java.util.HashMap;
 2 import java.util.Iterator;
 3 import java.util.Map;
 4 import java.util.Map.Entry;
 5 
 6 public class TestMap {
 7     /**
 8      * @param args
 9      */
10     public static void main(String[] args) {
11         // TODO Auto-generated method stub
12         Map m = new HashMap();
13         m.put("sb", "s");
14         m.put("bs", "b");
15         Iterator<Entry<String, String>> it = m.entrySet().iterator();
16          while (it.hasNext()) {
17              Map.Entry<String, String> entry =  it.next();  
18              String key = entry.getKey();  
19              String value = entry.getValue();
20              System.out.println("key = " + key + "; value = " + value); 
21          }
22     }
23 }