java wait() notifyAll()的用法

本例阐述了java中wait() 和 notifyAll()的用法，摘自think in java 4th ，下面上代码：

class Car {
	private boolean waxOn = false;

	public synchronized void waxed() {
		waxOn = true;
		notifyAll();
	}

	public synchronized void buffed() {
		waxOn = false;
		notifyAll();
	}

	public synchronized void waitForWaxing() throws InterruptedException {
		if (waxOn == false) {
			wait();
		}
	}

	public synchronized void waitForBuffing() throws InterruptedException {
		if (waxOn == true) {
			wait();
		}
	}
}

class WaxOn implements Runnable {
	private Car car;

	public WaxOn(Car car) {
		this.car = car;
	}

	@Override
	public void run() {
		try {
			while (!Thread.interrupted()) {
				System.out.println("Wax On!");
				TimeUnit.MILLISECONDS.sleep(200);
				car.waxed();
				car.waitForBuffing();
			}
		} catch (InterruptedException e) {
			System.out.println("Exiting via interrupt");
		}
		System.out.println("Ending Wax on task");
	}
}

class WaxOff implements Runnable {
	private Car car;

	public WaxOff(Car car) {
		this.car = car;
	}

	@Override
	public void run() {
		try {
			while (!Thread.interrupted()) {
				car.waitForWaxing();
				System.out.println("Wax Off!");
				TimeUnit.MILLISECONDS.sleep(200);
				car.buffed();
			}
		} catch (InterruptedException e) {
			System.out.println("Exiting via interrupt");
		}
		System.out.println("Ending Wax Off task");
	}
}

public class WaxOnMatic {
	public static void main(String[] args) throws InterruptedException {
		Car car = new Car();
		ExecutorService exec = Executors.newCachedThreadPool();
		exec.execute(new WaxOff(car));
		exec.execute(new WaxOn(car));
		TimeUnit.SECONDS.sleep(5);   //5 seconds after close the thread pool
		exec.shutdownNow();
	}
}