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}]