面试经典题：创建三个线程，按顺序依次循环打印hello+i

二面被问到的手撕题，自己总计一下。考察的还是比较基础的，但也是对自己知识领悟程度的考察。
写一个程序，要求创建三个线程依次打印hello+线程号。
考察多线程和同步的知识点应用
这里设置为打印10轮。

package 多线程;

/**
 * @Author wuyifan
 * @Date 2024/6/4 20:11
 * @Version 1.0
 */
class PrintSequence implements Runnable {
    private int threadId;
    private static final Object lock = new Object();
    private static int currentThreadId = 0;
    private int printCount = 10;

    public PrintSequence(int threadId) {
        this.threadId = threadId;
    }

    @Override
    public void run() {
        for (int i = 0; i < printCount; ) {
            synchronized (lock) {
                if (currentThreadId % 3 == threadId) {
                    System.out.println("Thread " + threadId + ": hello" + (i + 1));
                    i++;
                    currentThreadId++;
                    lock.notifyAll(); // 唤醒所有等待的线程
                } else {
                    try {
                        lock.wait(); // 等待其他线程的唤醒
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

public class New3Thread {
    public static void main(String[] args) {
        Thread t1 = new Thread(new PrintSequence(0), "T1");
        Thread t2 = new Thread(new PrintSequence(1), "T2");
        Thread t3 = new Thread(new PrintSequence(2), "T3");

        t1.start();
        t2.start();
        t3.start();
    }
}