JAVA模拟高并发

最新推荐文章于 2021-12-22 16:47:50 发布

原创最新推荐文章于 2021-12-22 16:47:50 发布 · 674 阅读

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本文介绍了一个简单的Java程序，用于模拟高并发场景。通过使用`CountDownLatch`来控制多个线程的同时启动，演示了如何实现线程间的同步。该程序创建了指定数量的线程，并在倒计时结束后同时执行这些线程。

import java.util.concurrent.CountDownLatch;

/**
 * 模拟高并发
 * User: Scott
 * Date: 2018/4/14
 * Time: 20:41
 */
public class UserDo implements Runnable {
    // 并发的用户数(同时并发的线程数)
    private static final int threadNum = 1;
    // 倒计数,用于制造线程的并发执行
    private static CountDownLatch countDownLatch = new CountDownLatch(threadNum);

    private String msg;
    public UserDo(String msg) {
        this.msg = msg;
    }

    @Override
    public void run() {
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(msg);
    }

    public static void main(String[] args) {
        for(int i=0; i< threadNum; i++) {
            new Thread(new UserDo("do something " + i)).start();
            countDownLatch.countDown();
        }
    }
}