Java事件和事件侦听器 [英] Java events and event listeners

问题描述

我在Google上搜索了解如何创建自定义事件和事件侦听器。阅读一些关于它的文章后，我仍然感到困惑。我想请你们审查
制作自定义事件（非GUI相关事件）和处理程序的方式。有些人可以提供一个关于如何创建自定义事件和监听器的简单说明？

解决方案

你基本上创建一个接口作为监听器，如

  public interface EatListener {
 
 ... 
 
} $ b您可以在EatListener类中使用$ b  

，您可以使用事件调用方法作为方法的参数;例如

  public void onEat（EatEvent）; 
  

那么你可以有一个类，像Human实现或实例化一个EatListener;例如

  public class Human {
 
 private EatListener listener; 
 
 public void eatFood（食物食物）{
 if（listener！= null）{
 listener.onEat（new EatEvent（food））; 
} 
} 
 
} 
  

那么你需要有实际的EatEvent;这可以像食物的包装一样简单，可能还有一些额外的数据。

与任何GUI上的GUI一样，您可以从该界面创建匿名内部类：

  new EatListener（）{
 public void onEat（EatEvent event）{
 System.out.println（I just ate+ event.getFood（）。getName（））; 
} 
} 
  

I searched on Google to learn how to create custom events and event listeners. After reading some articles about it, I'm still confused. I would like to ask you guys for a review of the ways for making custom events (non-GUI related events) and handlers. Can some provide a simple explanation on how to create custom events and listeners?

解决方案

You basically create an interface as the listener such as

public interface EatListener {

    ...

}

inside the EatListener class, you have method that you call with the event as the method's parameter; such as

public void onEat(EatEvent);

then you can have a class like Human that implements or instantiates an EatListener; such as

public class Human {

    private EatListener listener;

    public void eatFood(Food food) {
        if(listener != null) {
            listener.onEat(new EatEvent(food));
        }
    }

}

then you need to have the actual EatEvent; which can be as simple as wrapper for food with possibly some extra data.

As with any GUI on java you can create anonymous inner classes from that interface:

new EatListener() {
    public void onEat(EatEvent event) {
        System.out.println("I just ate " + event.getFood().getName());
    }
}

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