android - java的LinkedHashMap序列化传递之后，只能反序列化为HashMap

Question

发送之前数据结构：

private LinkedHashMap<Integer, LinkedHashMap<Integer, Integer>> selected = new LinkedHashMap<>();

通过

Bundle bundle = new Bundle();
bundle.putSerializable("data", selected);

传递到下一个activity之后，使用

getIntent().getBundleExtra(G.BUNDLE).getSerializable("data")

只能得到HashMap类型的数据结构，HashMap<Integer, HashMap<Integer, Integer>>;
这是为什么呢？

Answer 1

LinkedHashMap is a subclass of HashMap. Have you tried explicit type conversion?

Answer 2

Convert it into a json string, pass it and then convert it back.

Answer 3

LinkedHashMap does not implement the serializable interface, and its parent class HashMap does. Therefore, it is deserialized into a HashMap and can be forced to perform explicit type conversion when used.