如何让JVM了解Java中的自定义标记接口 [英] How to let JVM know about custom marker interface in java

问题描述

是否可以用Java编写我们自己的标记接口.我正在写类似

Is that possible to write our own marker interface in java. I am writing a code like

public interface MyMarker {

}

这是标记界面吗?

如果可能的话，如何让JVM知道该接口是我自己创建的标记器接口?

If it is possible then how can I let JVM know that this interface is my own created marker interface?

推荐答案

是的，这是一个标记接口.您可以像以下这样简单地测试对象是否实现"了它:

Yes, that's a marker interface. You would test whether an object "implemented" it as simply as:

if (x instanceof MyMarker)

对于特定的类(而不是对象)

For a particular class (instead of object) you'd want

if (MyMarker.isAssignableFrom(otherClass))

您应该考虑使用注释而不是标记界面.它们并不总是直接替代，但在许多情况下，它们用于相同的目标，并且注记(IMO)更干净.

You should consider using annotations instead of marker interfaces though. They're not always direct replacements, but in many cases they're used for the same goals, and annotations are (IMO) cleaner.

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