Java中标记接口的用途是什么? [英] What is the use of marker interfaces in Java?

问题描述

当Serializable之类的标记接口没有什么可实现的时候，实现它有什么用?

When there is nothing to implement in the marker interfaces like Serializable What is the use of implementing it?

推荐答案

在 Java 的早期版本中，标记接口 是声明类元数据的唯一方法.例如，Serializable Marker Interface 让类的作者说他们的类在序列化和反序列化时会正确运行.

In earlier versions of Java, Marker Interfaces were the only way to declare metadata about a class. For example, the Serializable Marker Interface lets the author of a class say that their class will behave correctly when serialized and deserialized.

在现代 Java 中，标记接口没有位置.它们可以完全替换为 Annotations，其中允许非常灵活的元数据功能.如果您有关于某个类的信息，并且该信息永远不会改变，那么注释是一种非常有用的表示方式.

In modern Java, marker interfaces have no place. They can be completely replaced by Annotations, which allow for a very flexible metadata capability. If you have information about a class, and that information never changes, then annotations are a very useful way to represent it.

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