线程例子[Condition, SignlAll, await]

package concurrency.waxomatic;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class Car2{
	private Lock lock = new ReentrantLock();
	private Condition condition = lock.newCondition();
	private boolean waxOn = false;
	public void waxed(){
		lock.lock();
		try {
			waxOn = true;	// Ready to buff;
			condition.signalAll();
		} finally {
			lock.unlock();
		}
	}
	public void buffed(){
		lock.lock();
		try{
			waxOn = false;	// Ready for another coat of wax
			condition.signalAll();
		}finally{
			lock.unlock();
		}
	}
	public void waitForWaxing() throws InterruptedException{
		lock.lock();
		try{
			while(waxOn == false){
				condition.await();
			}
		}finally{
			lock.unlock();
		}
	}
	public void waitForBuffing() throws InterruptedException{
		lock.lock();
		try{
			while(waxOn == true)
				condition.await();
		}finally{
			lock.unlock();
		}
	}
}

class WaxOn2 implements Runnable{
	private Car car;
	public WaxOn2(Car c){
		car  = c;
	}
	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 WaxOff2 implements Runnable{
	private Car car;
	public WaxOff2(Car c){
		car = c;
	}
	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 WaxOMatic2 {
	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);
		exec.shutdownNow();
	}
}