多线程面试题-顺序输出

public class Ex5 {
    AtomicInteger num=new AtomicInteger(0);
    ReentrantLock lock=new ReentrantLock(true);

    void work(){
        String n=Thread.currentThread().getName();
        while (true){
            lock.lock();
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.printf("%s%d ",n,num.incrementAndGet());
            if ("C".equals(n)){
                System.out.println();
            }
            
            lock.unlock();
        }
    }

    public static void main(String[] args) {
        var t=new Ex5();
        new Thread(t::work,"A").start();
        new Thread(t::work,"B").start();
        new Thread(t::work,"C").start();
    }

}