如何制作对象的深层副本？

梦里梦外; 2022-11-28 10:51 85阅读 0赞

本文翻译自：[How do you make a deep copy of an object?][How do you make a deep copy of an object]

*It's a bit difficult to implement a deep object copy function.* **实现深层对象复制功能有点困难。** *What steps you take to ensure the original object and the cloned one share no reference?* **您采取什么步骤来确保原始对象和克隆对象没有引用？**

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### \#1楼 ###

参考：[https://stackoom.com/question/gEQ/如何制作对象的深层副本][https_stackoom.com_question_gEQ]

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### \#2楼 ###

*You can [use a library][] that has a simple API, and performs relatively fast cloning with reflection (should be faster than serialization methods).* **您可以[使用][use a library]具有简单API [的库][use a library] ，并使用反射执行相对较快的克隆（应该比序列化方法要快）。**

Cloner cloner = new Cloner();
    
    MyClass clone = cloner.deepClone(o);
    // clone is a deep-clone of o

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### \#3楼 ###

*XStream is really useful in such instances.* **XStream在这种情况下确实很有用。** *Here is a simple code to do cloning* **这是执行克隆的简单代码**

private static final XStream XSTREAM = new XStream();
    ...
    
    Object newObject = XSTREAM.fromXML(XSTREAM.toXML(obj));

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### \#4楼 ###

我使用[Dozer][]克隆Java对象，这很不错， [Kryo][]库是另一个很好的选择。

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### \#5楼 ###

Apache Commons提供了一种快速克隆对象的快速方法。

My_Object object2= org.apache.commons.lang.SerializationUtils.clone(object1);

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### \#6楼 ###

[BeanUtils][]在深度克隆豆方面做得非常好。

BeanUtils.cloneBean(obj);

[How do you make a deep copy of an object]: https://oldbug.net/q/gEQ/How-do-you-make-a-deep-copy-of-an-object
[https_stackoom.com_question_gEQ]: https://stackoom.com/question/gEQ/%E5%A6%82%E4%BD%95%E5%88%B6%E4%BD%9C%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%B7%B1%E5%B1%82%E5%89%AF%E6%9C%AC
[use a library]: https://github.com/kostaskougios/cloning
[Dozer]: https://github.com/DozerMapper/dozer
[Kryo]: https://github.com/EsotericSoftware/kryo
[BeanUtils]: http://commons.apache.org/proper/commons-beanutils/