什么是Java中使用的标志接口？ [英] What is the use of marker interfaces in Java?

问题描述

当没有什么像序列化的标记接口来实现。 。有什么用实施呢？

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

推荐答案

在早期版本的Java，标记接口是的只有这样，才能申报有关类的元数据。例如，序列化的标记接口，让类的作者说，他们的课程将正确的行为时，序列化和反序列化。

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.

在现代的Java，标记接口都没有的地方。他们可以通过注解，这允许非常灵活的可完全取代元数据功能。如果您对一个类的信息，而这些信息不会改变，那么注解是重新present这是一个非常有用的方式。

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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