线程的使用—嘀嗒嘀嗒计时器

本文主要是介绍线程的使用—嘀嗒嘀嗒计时器，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

目的

编写一个精确定时的小工具

编程实现

此程序包含两个线程

DidaDida线程：功能是计时，当时间到了则唤醒DidaDidaWorker线程
DidaDidaWorker线程：当时间到了之后要干的事情

这是DidaDida类的三个抽象方法

    public abstract void didadidaRunning();public abstract void didadidaStop();public abstract void itIsTheTime();

DidaDidaWorker线程

这是一个内部类，当启动这个线程时，先将其wiat()，变成阻塞态，等待被唤醒；这个内部类的作用是到时间之后要干的事情。

    public class DidaDidaWorker implements Runnable {public DidaDidaWorker() {}@Overridepublic void run() {while (goon) {synchronized (this) {try {this.wait();if (goon) {itIsTheTime();}} catch (InterruptedException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}}}

开始计时

创建一个DidaDidaWorker线程并将其启动（启动后是本线程是阻塞态，并没有开始执行真正的代码）；再创建本类的线程，用wait()将其阻塞，当真正开始运行run()方法的代码时再将其唤醒。

    public void startDidaDida() {goon = true;worker = new DidaDidaWorker();Thread workerThread = new Thread(worker);workerThread.setPriority(Thread.MAX_PRIORITY);workerThread.start();synchronized (lock) {new Thread(this, "DidaDida").start();try {lock.wait();} catch (InterruptedException e) {e.printStackTrace();}}}

本类的线程（DidaDida的线程）

将worker线程wait指定秒数，再将其唤醒，执行itIsTheTime()方法

@Overridepublic void run() {synchronized (lock) {lock.notify();}if (waitTime == 0) {waitTime = DEFAULT_TIME;}didadidaRunning();while (goon) {synchronized (worker) {try {worker.wait(waitTime);worker.notify();} catch (InterruptedException e) {e.printStackTrace();}}}didadidaStop();}

测试

public class DidaDidaDemo extends DidaDida {private volatile int count;private String name;public DidaDidaDemo(int didadidaTime, String name) {this.name = name;setClock(didadidaTime);}public void startDidadida() {count = 0;startDidaDida();}public void stopDidadida() {didadidaStop();}@Overridepublic void didadidaRunning() {System.out.println(CurrentTime.logMessage("滴答滴答开始工作……"));}@Overridepublic void didadidaStop() {System.out.println(CurrentTime.logMessage("滴答滴答停止工作"));}@Overridepublic void itIsTheTime() {System.out.println(CurrentTime.logMessage("线程" + name+ "：第" + ++count + "次工作！"));}}

	public static void main(String[] args) {DidaDidaDemo dida1 = new DidaDidaDemo(1000, "第一个");Scanner in = new Scanner(System.in);String message = "";while (!message.equalsIgnoreCase("x")) {message = in.nextLine();if (message.equalsIgnoreCase("st")) {dida1.startDidadida();} else if (message.equalsIgnoreCase("sp")) {dida1.stopDidaDida();}}in.close();}

运行结果