问题描述
什么是标记接口以及它们用于什么？
What are tagging interfaces and what are they used for?
推荐答案
因为有时候，如果某些属性是真的有意义一个类型可以用作一个类型本身 - Serializable 浮现在脑海中。如果我做这样的方法：
Because sometimes, it really makes sense if some property of a type can be used as a type itself - Serializable comes to mind. If I make a method like this:
public void save(Object data){ ... }
...你真的不知道数据将如何保存。 VM序列化？ Bean属性序列化？一些自制方案？如果你这样写：
... you don't really know how that data will be saved. VM serialization? Bean property serialization? Some homebrewed scheme? Whereas if you write it like this:
public void save(Serializable data){ ... }
......很明显（如果只有 ObjectOutputStream的设计者曾经使用过这种可能性！）。有时，当您想要将元数据添加到类型时使用注释是有意义的，但在这种情况下，我会争论标记接口。
... it is quite clear (if only the designer of ObjectOutputStream had used this possibility!). Sometimes it makes sense to use annotations when you want to add meta-data to types, but in this case, I'd argue for a tagging interface.
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