Map的value是否可以为null？

    public static void main(String[] args) {
        Map<String,Boolean> searcher = new HashMap<>();
        searcher.put("one",null);
        searcher.put("two",null);
        searcher.put("three",null);
        System.out.println(MapUtils.isEmpty(searcher));
        System.out.println(JsonUtils.toJson(searcher));
    }

示例

标签：Map,searcher,System,value,put,null,out
来源： https://blog.csdn.net/LyySwx/article/details/111051195