一、截图示例

二、代码示例

package com.learning.cyclicbarrier;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @Author wangyouhui
 * @Description 循环栅栏
 **/
@Slf4j
public class Learning_01<main> {
    public static void main(String[] args) {
        ExecutorService service = Executors.newFixedThreadPool(3);
        CyclicBarrier barrier = new CyclicBarrier(3, ()->{
           log.info("3个人已凑齐，发车");
        });

        for (int i = 0; i < 10; i++) {
            int j = i+1;
            service.submit(()->{
                try {
                    Thread.sleep(1000);
                    log.info("第" + j + "车 1号座已入座");
                    barrier.await();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });

            service.submit(()->{
                try {
                    Thread.sleep(2000);
                    log.info("第" + j + "车 2号座已入座");
                    barrier.await();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });

            service.submit(()->{
                try {
                    Thread.sleep(3000);
                    log.info("第" + j + "车 3号座已入座");
                    barrier.await();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        }
        service.shutdown();
    }
}