遍历Map java

	List arrayList = new ArrayList(dateMaps.entrySet());
		Collections.sort(arrayList, new Comparator() {
			   public int compare(Object o1, Object o2) {
			    Map.Entry obj1 = (Map.Entry) o1;
			    Map.Entry obj2 = (Map.Entry) o2;
			    return (Integer.parseInt(obj1.getKey().toString())-Integer.parseInt(obj2.getKey().toString()));
			   }
			  });