import java.util.concurrent.locks.Condition;

import java.util.concurrent.locks.ReentrantLock;

/**

* 编写一个程序，开启三个线程，这三个线程的 ID 分别是 A、B 和 C，每个线程把自己的 ID 在屏幕上打印 10 遍，

* 要求输出结果必须按 ABC 的顺序显示，如 ABCABCABC... 依次递推

*

* 使用 Lock 搭配 Condition 实现

*/

public class AbcLockCondition {

public static void main(String[] args) {

ReentrantLock lock = new ReentrantLock();

Condition a = lock.newCondition();

Condition b = lock.newCondition();

Condition c = lock.newCondition();

new Thread(()-> {

while (true) {

lock.lock();

System.out.print(Thread.currentThread().getName());

b.signal();

try {

a.await();

} catch (InterruptedException e) {

e.printStackTrace();

}finally {

lock.unlock();

}

}

}, "A").start();

new Thread(()-> {

while (true) {

lock.lock();

System.out.print(Thread.currentThread().getName());

c.signal();

try {

b.await();

} catch (InterruptedException e) {

e.printStackTrace();

}finally {

lock.unlock();

}

}

}, "B").start();

new Thread(()-> {

while (true) {

lock.lock();

System.out.println(Thread.currentThread().getName());

a.signal();

try {

c.await();

} catch (InterruptedException e) {

e.printStackTrace();

}finally {

lock.unlock();

}

}

}, "C").start();

}

}