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();
}
}
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