java Map 转 List

老是用到Map转list的方法，可总是记不住，想想还是自己写下来吧，这样好点。

	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));
        }
    }

这样就不容易忘了。

评论

1 楼 AHoS 2015-11-10  

      public static void testMapVoid() {  
           Map<String,String> map = new HashMap<String,String>();  
           map.put("a", "a1");  
           map.put("b", "b1");  
           map.put("c", "c1");  
           List<String> listKey = new ArrayList<String>();  
           List<String> listValue = new ArrayList<String>();
           for(Map.Entry<String,String> e : map.entrySet()){
               listKey.add(e.getKey());
               listValue.add(e.getValue());
           }
           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));  
           }  
       }