对Map排序

 一下代码为给一个hashMap的key排序，value排序一样处理

 

public static List<Map.Entry<String, Integer>> sortHashMapInteger(HashMap<String, Integer> map, final String dateFormat) {
		List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
		// 排序
		Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
			public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
				//return ( o1.getKey()-o2.getKey());
				String key1 = o1.getKey();
				String key2 = o2.getKey();
				Date day1 = null;
				Date day2 = null;
				try {
					day1 = DateUtils.getDateByFormat(key1, dateFormat);
					day2 = DateUtils.getDateByFormat(key2, dateFormat);
				} catch (Exception e) {
					e.printStackTrace();
				}
				 
				return (day1.after(day2) == true ? 1 : 0);
			}
		});
		return list;
	}