순서대로 교체 인쇄 ABC

 new Thread(new Runnable() {
 	
 	@Override
 	public void run() {
 		for (int i = 1; i <= 10; i++) {
 			ad.loopA(i);
 		}
 	}
 }, "A").start();
 
 new Thread(new Runnable() {
 	
 	@Override
 	public void run() {
 		for (int i = 1; i <= 10; i++) {
 			ad.loopB(i);
 		}
 	}
 }, "B").start();
 
 new Thread(new Runnable() {
 	
 	@Override
 	public void run() {
 		for (int i = 1; i <= 10; i++) {
 			ad.loopC(i);
 		}
 	}
 }, "C").start();

private int number = 1; //           

private Lock lock = new ReentrantLock();
private Condition c1 = lock.newCondition();
private Condition c2 = lock.newCondition();
private Condition c3 = lock.newCondition();

public void loopA(int totalLoop){
	lock.lock();
	
	try {
		
		//  
		if(number != 1){
			try {
				c1.await();
			} catch (InterruptedException e) {
			}
		}
		
		//  
		for (int i = 1; i <= 1; i++) {
			System.out.println(Thread.currentThread().getName() + " : " + i + " : " + totalLoop);
		}
		
		//  
		number = 2;
		c2.signal();
		
	} finally {
		lock.unlock();
	}
}

public void loopB(int totalLoop){
	lock.lock();
	
	try {
		
		//  
		if(number != 2){
			try {
				c2.await();
			} catch (InterruptedException e) {
			}
		}
		
		//  
		for (int i = 1; i <= 1; i++) {
			System.out.println(Thread.currentThread().getName() + " : " + i + " : " + totalLoop);
		}
		
		//  
		number = 3;
		c3.signal();
		
	} finally {
		lock.unlock();
	}
}

public void loopC(int totalLoop){
	lock.lock();
	
	try {
		
		//  
		if(number != 3){
			try {
				c3.await();
			} catch (InterruptedException e) {
			}
		}
		
		//  
		for (int i = 1; i <= 1; i++) {
			System.out.println(Thread.currentThread().getName() + " : " + i + " : " + totalLoop);
		}
		
		//  
		number = 1;
		c1.signal();
		
	} finally {
		lock.unlock();
	}
}