观察者模式的一个示例

最新推荐文章于 2025-03-20 16:43:39 发布

原创最新推荐文章于 2025-03-20 16:43:39 发布 · 751 阅读

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//设计一个事件源,被监听器监听,观察者设计模式
public class Demo1 {

	public static void main(String[] args) {
		
		Person person = new Person();
		
		person.registerListener(new PersonListener() {
			
			public void dorun(Event e) {
				Person person = e.getSource();
				System.out.println(person + " 跑死你");
			}
			
			public void doeat(Event e) {
				Person person = e.getSource();
				System.out.println(person + " 吃死你");
			}
		});
		person.eat();
	}
	
}


class Person{
	
	private PersonListener listener;
	
	public void eat(){
		
		if(listener != null){
			listener.doeat(new Event(this));
		}
		
	}
	
	public void run() {
		if(listener != null){
			listener.dorun(new Event(this));
		}
	}
	
	public void registerListener(PersonListener listener){
		
		this.listener = listener;
		
		
	}
	
}

interface PersonListener{
	
	public void doeat(Event e);
	
	public void dorun(Event e);
	
}

class Event{
	
	private Person source;
	
	public Event() {
		super();
	}
	
	public Event(Person source) {
		super();
		this.source = source;
	}

	public Person getSource() {
		return source;
	}

	public void setSource(Person source) {
		this.source = source;
	}

}