java Map 转 List

public static void testMapVoid () {  
       Map map = new HashMap();  
       map.put("a", "a1");  
       map.put("b", "b1");  
       map.put("c", "c1");  
  
       List listKey = new ArrayList();  
       List listValue = new ArrayList();  
       Iterator it = map.keySet().iterator();  
       while (it.hasNext()) {  
           String key = it.next().toString();  
           listKey.add(key);  
           listValue.add(map.get(key));  
       }  
       System.out.println("Convert Finished !");  
         
       for(int i =0 ;i<listKey.size();i++){  
           System.out.print("Key :"+listKey.get(i));  
           System.out.println("     Value :"+listValue.get(i));  
       }  
   }