Java中的事件监听器 [英] Event Listeners in Java

问题描述

我一直在使用AS3中的事件监听器，但似乎在java中没有（除了图形组件）。这是令人惊讶的。

I've been working with event listeners in AS3, but seems like there is none in java (except for graphics components). It's surprising.

问题是，我怎样才能在java中实现自己的事件监听器？也许有人之前做过那样的工作？

The question is, how could i implement my own event listener in java? Maybe someone did that work before?

推荐答案

你可以定义一个监听器界面：

You can define a Listener interface:

public interface EventListener {
    void fireEvent (Event e);
}

然后在你的代码中：

EventListener lst = new EventListener() {
    @Override
    public void fireEvent (Event e) {
        //do what you want with e
    }
}

someObject.setListener(lst);
someObject.somethingHappened();

然后在someObject中（实际上你可能会有一个监听器列表）：

Then in someObject (in practice you would probably hold a list of listeners):

public class SomeObject {
    private EventListener lst;

    public void setListener (EventListener lst) {
        this.lst = lst;
    }

    public void somethingHappened () {
        lst.fireEvent(new Event("Something Happened"));
    }
}

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