Map

Map常用方法

判断Map中Value的数据类型

 public static void main(String[] args) {
        Map<String,Object> map = new LinkedHashMap<>();
        map.put("aaa",new HashMap<>());
        map.put("bbb",new ArrayList<>());
        map.put("ccc","String");
        map.keySet().forEach(key ->{
            Object object = map.get(key);
            if (object instanceof Map){
                System.out.println(key+"\tMap:"+object);
            } else if (object instanceof List){
                System.out.println(key+"\tList:"+object);
            } else {
                System.out.println(key+"\tElse:"+object);
            }
        });
    }