Java中事件的使用

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import java.util.*;// An interface to be implemented by everyone interested in "Hello" eventsinterface HelloListener {    public void someoneSaidHello();}// Someone who says "Hello"class Initiater {    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" eventsclass 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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