List sort comparator按照自定义规则排序

statusList           I   R  N

return                  N  R  I

	public String handStateGroup(List<String> statusList) {
		StringBuffer queryBuf = new StringBuffer();
		HashMap<String, Integer> keyMap = new HashMap(){{
			put("A",1);
			put("N",2);
			put("V",3);
			put("R",4);
			put("I",5);
		}};
		statusList.sort(new Comparator() {
			@Override
			public int compare(Object o1, Object o2) {
				if(keyMap.get(o1)==null || keyMap.get(o2)==null) {
					return 1;
				}
				return keyMap.get(o1).compareTo(keyMap.get(o2));
			}
		});
		
		statusList.forEach((_status)->{
			queryBuf.append(_status);
		});
		return queryBuf.toString();
	}