java——多线程回调函数

系统管理员 2022-04-25 05:46 447阅读 0赞

原文：[https://blog.csdn.net/qq\_34996727/article/details/80416277][https_blog.csdn.net_qq_34996727_article_details_80416277]

修改了原文中： Thread 的方法 stop()，改为用标志位来终止线程

package thread_rabbit_tortoise;
    
    public abstract class Animal extends Thread {
    	 volatile boolean stop = false;
    	public int length = 30;// 比赛长度
    	public abstract void runing();
     
    	@Override
    	public void run() {
    		while (!stop&&length>0) {
    			runing();
    			  }
    	}
     
    	public void terminate() {
    		        stop = true;
    		     }
     
    	// 在需要回调数据的地方（两个子类需要），声明一个接口
    	public static interface Calltoback {
    		public void win();
    	}
     
    	// 2.创建接口对象
    	public Calltoback calltoback;
    }
    
    
    package thread_rabbit_tortoise;
    
    public class Rabbit extends Animal {
    	
    	public Rabbit() {
    		setName("兔子");
    	}
     
    	@Override
    	public void runing() {
    		//兔子速度
    		int dis = 5;
    		length -= dis;
     
    		System.out.println("兔子跑了" + dis + "米，距离终点还有" + length + "米");
    		if (length <= 0) {
    			length = 0;
    			System.out.println("兔子获得了胜利");
    			// 给回调对象赋值，让乌龟不要再跑了
    			if (calltoback != null) {
    				calltoback.win();
    			}
    		}
     
    		try {
    			if ((2000 - length) % 20 == 0) {	// 每20米休息一次,休息时间是1秒
    				sleep(1000);
    			} else {				//没0.1秒跑5米
    				sleep(100);
    			}
    		} catch (InterruptedException e) {
    			e.printStackTrace();
    		}
    	}
     
    }
    
    
    
    package thread_rabbit_tortoise;
    
    public class Tortoise extends Animal {
    	public Tortoise() {
    		setName("乌龟");// Thread的方法，给线程赋值名字
    	}
     
    	// 重写running方法，编写乌龟的奔跑操作
    	@Override
    	public void runing() {
    		// 乌龟速度
    		int dis = 2;
    		length -= dis;
    		System.out.println("乌龟跑了" + dis + "米，距离终点还有" + length + "米");
    		if (length <= 0) {
    			length = 0;
    			System.out.println("乌龟获得了胜利");
    			// 让兔子不要在跑了
    			if (calltoback != null) {
    				calltoback.win();
    			}
    		}
    		try {
    			sleep(100);						//没0.1秒跑2米
    		} catch (InterruptedException e) {
    			e.printStackTrace();
    		}
    	}
     
    }
    
    
    
    package thread_rabbit_tortoise;
    
    import thread_rabbit_tortoise.Animal.Calltoback;
    
    public class LetOneStop implements Calltoback {
    	// 动物对象
    	Animal an;
     
    	// 获取动物对象，可以传入兔子或乌龟的实例
    	public LetOneStop(Animal an) {
    		this.an = an;
    	}
     
    	// 让动物的线程停止
    	@Override
    	public void win() {
    		// 线程停止
    		an.terminate();
    	}
    }
    
    
    package thread_rabbit_tortoise;
    
    public class MainClass {
    
    	public static void main(String[] args) {
    
    		Tortoise tortoise = new Tortoise();
    		Rabbit rabbit = new Rabbit();
    
    		LetOneStop letOneStop1 = new LetOneStop(tortoise);
    		rabbit.calltoback = letOneStop1;
    		LetOneStop letOneStop2 = new LetOneStop(rabbit);
    		tortoise.calltoback = letOneStop2;
    
    		tortoise.start();
    		rabbit.start();
    	}
     
    }

[https_blog.csdn.net_qq_34996727_article_details_80416277]: https://blog.csdn.net/qq_34996727/article/details/80416277