list添加map问题

结论：

    list添加添加的是map的地址

 

List<Map<String, Object>> list = new ArrayList<>();

           Map<String, Object> map = new HashMap<>();

           for (int a = 0; a < 2; a++) {

                map.put("a", a);

                map.put("b", a);

                list.add(map);

           }

           System.out.println(list);

结果：

[{b=1, a=1}, {b=1, a=1}]

 

<<<<<<<<<<<=======分割线=====>>>>>>>>>>>>>>>>>>>>

 

List<Map<String, Object>> list = new ArrayList<>();

           for (int a = 0; a < 2; a++) {

                Map<String, Object> map = new HashMap<>();

                map.put("a", a);

                map.put("b", a);

                list.add(map);

           }

           System.out.println(list);

结果：

[{b=0, a=0}, {b=1, a=1}]