在Java中创建一个自定义事件 [英] Create a custom event in Java

问题描述

当事件对象1发出你好的时候，
然后对象2通过说hello来响应该事件。

有人可以给我一个提示或示例代码？

解决方案

您可能想查看观察者模式。

以下是一些自己开始的示例代码：

  import java.util。*; 
 
 //所有对Hello事件感兴趣的人都要实现的接口
 interface HelloListener {
 void someoneSaidHello（）; 
} 
 
 //有人说你好
 class Initiator {
 private List< HelloListener> listeners = new ArrayList< HelloListener>（）; 
 
 public void addListener（HelloListener toAdd）{
 listeners.add（toAdd）; 
} 
 
 public void sayHello（）{
 System.out.println（Hello !!）; 
 
 //通知所有可能感兴趣的人。 
（HelloListener hl：listeners）
 hl.someoneSaidHello（）; 
} 
} 
 
 //对Hello事件感兴趣的人
 class Responder实现HelloListener {
 @Override 
 public void someoneSaidHello ）{
 System.out.println（Hello there ...）; 
} 
} 
 
 class Test {
 public static void main（String [] args）{
 Initiator initiatorater = new Initiater（）; 
响应者responder = new Responder（）; 
 
 initiatorater.addListener（responder）; 
 
 initiatorater.sayHello（）; //打印你好!!!和你好...
} 
} 
  

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相关文章： Java：创建自定义事件

I want to do something like this in Java but I don't know the way:

When event "object 1 say 'hello'" happens, then object 2 responds to that event by saying "hello".

Can somebody give me a hint or sample code?

解决方案

You probably want to look into the observer pattern.

Here's some sample code to get yourself started:

import java.util.*;

// An interface to be implemented by everyone interested in "Hello" events
interface HelloListener {
    void someoneSaidHello();
}

// Someone who says "Hello"
class Initiater {
    private List<HelloListener> listeners = new ArrayList<HelloListener>();

    public void addListener(HelloListener toAdd) {
        listeners.add(toAdd);
    }

    public void sayHello() {
        System.out.println("Hello!!");

        // Notify everybody that may be interested.
        for (HelloListener hl : listeners)
            hl.someoneSaidHello();
    }
}

// Someone interested in "Hello" events
class Responder implements HelloListener {
    @Override
    public void someoneSaidHello() {
        System.out.println("Hello there...");
    }
}

class Test {
    public static void main(String[] args) {
        Initiater initiater = new Initiater();
        Responder responder = new Responder();

        initiater.addListener(responder);

        initiater.sayHello();  // Prints "Hello!!!" and "Hello there..."
    }
}

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Related article: Java: Creating a custom event

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