Java 序列化:readObject() 与 readResolve() [英] Java serialization: readObject() vs. readResolve()

问题描述

Effective Java 一书和其他来源很好地解释了在使用可序列化 Java 类时如何以及何时使用 readObject() 方法.另一方面，readResolve() 方法仍然有点神秘.基本上我发现的所有文件要么只提到两者之一，要么只单独提到两者.

The book Effective Java and other sources provide a pretty good explanation on how and when to use the readObject() method when working with serializable Java classes. The readResolve() method, on the other hand, remains a bit of a mystery. Basically all documents I found either mention only one of the two or mention both only individually.

未回答的问题是:

• 这两种方法有什么区别?
• 什么时候应该实施哪种方法?
• 应该如何使用 readResolve()，尤其是在返回什么方面?

• What is the difference between the two methods?
• When should which method be implemented?
• How should readResolve() be used, especially in terms of returning what?

我希望你能对这件事有所了解.

I hope you can shed some light on this matter.

推荐答案

readResolve 用于替换从流中读取的对象.我见过的唯一用途是强制单例；读取对象时，将其替换为单例实例.这确保没有人可以通过序列化和反序列化单例来创建另一个实例.

readResolve is used for replacing the object read from the stream. The only use I've ever seen for this is enforcing singletons; when an object is read, replace it with the singleton instance. This ensures that nobody can create another instance by serializing and deserializing the singleton.

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