如何在Java中创建对象的深层副本？ [英] How do you make a deep copy of an object in Java?

问题描述

在java中，实现深层对象复制功能有点困难。你采取什么步骤来确保原始对象和克隆的一个共享没有引用？

In java it's a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference?

推荐答案

一种安全的方法是序列化对象，然后反序列化。这可确保一切都是全新的参考。

A safe way is to serialize the object, then deserialize. This ensures everything is a brand new reference.

这里有一篇关于如何有效地做到这一点的文章。

Here's an article about how to do this efficiently.

注意：类可以重写序列化，实例不是创建的，例如为单身。如果你的类不是Serializable，这当然不工作。

Caveats: It's possible for classes to override serialization such that new instances are not created, e.g. for singletons. Also this of course doesn't work if your classes aren't Serializable.

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