对List中的 map 排序

结果：

[{amount2=1.2}, {amount2=1.3}]

倒序：

	public static void main(String args[]){
	    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
        Map<String, Object> map = new HashMap<String, Object>();
        Map<String, Object> map2 = new HashMap<String, Object>();
        map.put("amount2","1.2");
        map2.put("amount2","1.3");
        list.add(map);
        list.add(map2);


        Collections.sort(list,new Comparator<Map<String, Object>>(){
            public int compare(Map<String, Object> arg0, Map<String, Object> arg1) {
                return Double.valueOf(arg1.get("amount2").toString()).compareTo (Double.valueOf(arg0.get("amount2").toString()));
            }
        });

            System.out.println(list);

    }

结果：

[{amount2=1.3}, {amount2=1.2}]