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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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