如何计算serialversionuid [英] How serialversionuid is calculated

问题描述

当我在Eclipse中创建实现 Serializable 接口的Java Class时，我收到一个警告

When I create Java Class in Eclipse which implements Serializable interface, I get a warning

可序列化类ABCD不声明一个静态final
serialVersionUID字段类型long

The serializable class ABCD does not declare a static final serialVersionUID field of type long

所以当我点击在警告中，我在Eclipse中获取了一个选项

So when I click on warning, I get a option in Eclipse to

添加生成的串行版本ID

Add generated Serial Version ID

一旦我选择了该选项，Eclipse会为我自动创建一个 serialVersionUID 变量。

Once I choose that option, Eclipse automatically creates a serialVersionUID variable for me.

现在我想知道在什么基础上生成这个数字。这是一个随机数？我可以提供我自己的随机数吗？

Now I wanted to know that on what basis that number is generated. It is a just any random number ? Can I provide any random number of my own ?

推荐答案

它是根据你的类的结构 - 字段，方法，等等。它在对象序列化规范 - 参阅本节

It is calculated based on the structure of your class - fields, methods, etc. It is specified in the Object Serialization Specification - see this section for the exact format.

该规范描述了没有提供任何值的情况，但自动生成使用相同的算法。

The spec describes what happens in no value is provided, but the autogeneration uses the same algorithm.

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