在 Java 中创建自定义事件 [英] Create a custom event in Java
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问题描述
我想用 Java 做这样的事情,但我不知道方法:
I want to do something like this in Java but I don't know the way:
当事件object 1 say 'hello'"发生时,然后对象 2 通过说你好"来响应该事件.
When event "object 1 say 'hello'" happens, then object 2 responds to that event by saying "hello".
有人能给我一个提示或示例代码吗?
Can somebody give me a hint or sample code?
推荐答案
您可能想要查看 observer模式.
以下是一些示例代码,您可以开始使用:
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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