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java代码中，红框中的静态变量有什么用？并没有用到呀？

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java代码中，红框中的静态变量有什么用？并没有用到呀？

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serialVersionUID适用于Java的序列化机制.

序列化操作的时候系统会把当前类的serialVersionUID写入到序列化文件中，当反序列化时系统会去检测文件中的serialVersionUID，判断它是否与当前类的serialVersionUID一致，如果一致就说明序列化类的版本与当前类版本是一样的，可以反序列化成功，否则失败


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