关于Gson在强转时的ClassCastException

关于Gson的坑人指出：

将list转化为json

String beanListToJson = gson.toJson(list, type);

将json还原为list

List<T > objectList = gson.fromJson(resultTemp, type);

 

那么坑来了——List<T>  list的这个T不能是Object（这里不是指语法错误）

Object有什么好处呢？

假如我有三个不一样的对象Student，Teacher，Master要放到List

list.add(student);

list.add(teacher);

list.add(master);

String beanListToJson = gson.toJson(list, type);

 

当你准备把json转成list的时候：

List<T > objectList = gson.fromJson(resultTemp, type);

Student student = (Student)objectList.get(0);

Teacher teacher = (Teacher)objectList.get(1);

Master master = (Master)objectList.get(2);

Duang!Duang!Duang!ClasscastException.无法强转。

 

那应该怎么做呢？

创一个对象People

Class People{

       Private Student student;

　　 Private Teacher teacher;

　　 Priavate Master master

}

list.add(people);

String beanListToJson = gson.toJson(list, type);

List<People > objectList = gson.fromJson(resultTemp, type);

People people = objectList.get(0);

Student student = people.getStudent();

Teacher teacher = people.get Teacher ();

Master master = people.get Master ();

恭喜你，成功！