如何反序列化文件回到原始类对象 [英] How to deserialize a file back to the original class object

问题描述

我创建了一个类，并使用Serializable将此类的对象定期保存到内部存储中。当我想检索这些对象时，我使用这种方法：

I created a class and I periodically save objects of this class to internal storage using Serializable. When I want to retrieve these objects, I use this approach:

for(File i: getFilesDir().listFiles()){
    //Skipped enclosing try-catch block
        FileInputStream fis = openFileInput(i.getName());
        ObjectInputStream ois = new ObjectInputStream(fis);
        SingleWallet theObjectWeWant = ois.readObject();
             }

这会导致编译时错误（类型不兼容）。如何从 ois.readObject（）返回的对象恢复类？我在做什么错？

This results in a compile-time error (Incompatible types). How do I get my class back from the object returned from ois.readObject()? What am I doing wrong?

推荐答案

我犯的错误是未能将新获得的对象转换为预期的类。

The mistake I made was failing to cast my newly gotten object to my intended class.

更改

SingleWallet theObjectWeWant = ois.readObject();

到

SingleWallet theObjectWeWant = (SingleWallet) ois.readObject();

有所作为。

基本上，我本该将对象从对象投射到SingleWallet。

Basically, I should have casted from object to SingleWallet.

我希望这可以帮助某个人。

I hope this helps someone out there.

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