public class HahaTime {          public static void main(String[] args) {                  /**          * 原来的日期          */         List list = new ArrayList();         list.add("2014-03-04 22:22:22");         list.add("2014-4-04 22:22:22");         list.add("2014-05-04 22:22:22");         list.add("2014-03-04 21:22:22");         list.add("2014-03-2 22:21:22");         list.add("2014-03-04 8:22:20");         list.add("2014-03-04 22:22:8");         list.add("2014-03-04 22:22:01");         list.add("2014-03-5 22:22:8");         SimpleDateFormat dateFormat = new SimpleDateFormat(                 "yyyy-MM-dd HH:mm:ss");         List list2 = new ArrayList();         /**          * 格式化原来的日期，转换为：xxxx-xx-xx xx:xx:xx这样的格式，          */         for (int i = 0; i < list.size(); i++) {             Date string;             try {                 /**                  * 转成标准日期                  */                 string = dateFormat.parse(list.get(i).toString());                 /**                  * 格式化成自己设定类型                  */                 String string2 = dateFormat.format(string);                 /**                  * 重新放入list集合                  */                 list2.add(string2);             } catch (ParseException e) {                 // TODO Auto-generated catch block                 e.printStackTrace();             }         }         Collections.sort(list2);         System.out.println("排序后");         for (int i = 0; i < list2.size(); i++) {             System.out.println(list2.get(i));         }         // Log.i("排序之前的list片段", "========" + list.toString());         // Collections.sort(list);         // SimpleDateFormat sdf = new SimpleDateFormat("HH：mm：ss");         // Log.i("排序后的情况，22222，", "=========" + list.toString());     }     public static class MapComparator implements             Comparator> {                  //@Override         public int compare(Map o1, Map o2) {             // TODO Auto-generated method stub             Date b1 = (Date) o1.get("time");             Date b2 = (Date) o2.get("time");             if (b2 != null) {                 return b1.compareTo(b2);             }             return 0;         }     }      }