Java侦听器必须继承自java.util.EventListener-为什么? [英] Java listener must inherit from java.util.EventListener - why?

问题描述

在javadoc中，它说EventListener是

In the javadoc it says that EventListener is

所有事件侦听器接口都必须扩展的标记接口."

"A tagging interface that all event listener interfaces must extend."

那是为什么?使自定义侦听器实现EventListner有什么意义?在某个地方对EventListner进行任何特殊处理吗?

Why is that? What's the significance of making a custom listener implement EventListner? Is there any special handling for EventListner somewhere?

推荐答案

可能由 javabeans内省.

例如，如果侦听器中缺少extends EventListener，则Netbeans beaninfo编辑器无法识别该事件.

For instance Netbeans beaninfo editor does not recognise the event if extends EventListener is missing from the Listener.

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