Java-马士兵设计模式学习笔记-观察者模式-OOD线程

一、概述

1.情景：孩子睡觉，醒后要吃东西，用java模拟此情况

2.设计：child类,Dad类，都继承Runnable,dad线程监视child线程(缺点：因为要监视，所以耗cup资源)

二、代码

Test.java

class Child implements Runnable {

	private boolean wakenUp = false;

	public boolean isWakenUp() {
		return wakenUp;
	}

	public void setWakenUp(boolean wakenUp) {
		this.wakenUp = wakenUp;
	}

	public void wakeUp(){
		wakenUp = true;
	}

	@Override
	public void run() {
		try {
			Thread.sleep(3000);
		} catch (Exception e) {
			e.printStackTrace();
		}
		wakeUp();
	}
}

class Dad implements Runnable{

	Child c;

	public Dad(Child c) {
		this.c = c;
	}

	@Override
	public void run() {
		while(!c.isWakenUp()){
			try {
				Thread.sleep(1000);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		feed(c);
	}

	private void feed(Child c) {
		System.out.println("feed child");
	}

}

public class Test {

	public static void main(String[] args) {
		Child c = new Child();
		Dad d = new Dad(c);
		new Thread(c).start();
		new Thread(d).start();;
	}
}

　　

运行结果：

3秒后出现