private Lock lock = new ReentrantLock();
	private Condition c1 = lock.newCondition();
	private Condition c2 = lock.newCondition();
	private Condition c3 = lock.newCondition();
	private int remark = 1;//

	public static void main(String[] args) throws InterruptedException {
		final ConditionTest test = new ConditionTest();
		new Thread(new Runnable() {
			@Override
			public void run() {
				while (true) {
					test.printA();
				}
	
			}
		}, "A").start();

		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					test.printB();
				}
				

			}
		}, "B").start();

		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					test.printC();
				}
	
			}
		}, "C").start();

	}

	public void printA() {
		lock.lock();
		if (remark != 1) {
			try {
				c1.await();
			} catch (InterruptedException e) {
			}
		}
		remark = 2;
		c2.signalAll();//依次喚醒下一個需要列印的執行緒
		System.out.print(Thread.currentThread().getName());
		lock.unlock();
	}

	public void printB() {
		lock.lock();
		if (remark != 2) {
			try {
				c2.await();
			} catch (InterruptedException e) {
			}
		}
		remark = 3;
		c3.signalAll();
		System.out.print(Thread.currentThread().getName());
		lock.unlock();
	}

	public void printC() {
		lock.lock();
		if (remark != 3) {
			try {
				c3.await();
			} catch (InterruptedException e) {
			}
		}
		remark = 1;
		c1.signalAll();
		System.out.print(Thread.currentThread().getName() + "t");
		lock.unlock();
	}