线程池创建线程并全部结束后执行主线程

曾经终败给现在 2023-03-13 11:49 4阅读 0赞

package service.query;
    
    import java.util.concurrent.*;
    
    public class BankStatementQuery {
    // 指定几个线程
        private  static final CountDownLatch countDownLatch = new CountDownLatch(3);
        public static void main(String[] args) {
            BlockingQueue<Runnable> bq = new ArrayBlockingQueue<Runnable>(10);
            // 创建线程池
            ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5);
            ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(3, 5, 50, TimeUnit.MILLISECONDS, bq);
    
            threadPoolExecutor.execute(new Runnable() {
                @Override
                public void run() {
    
                    try {
                        // 没有任何问题时，释放线程
                        countDownLatch.countDown();
                        System.out.printf("线程一");
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
            threadPoolExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    countDownLatch.countDown();
                    System.out.printf("线程二");
                }
            });
            threadPoolExecutor.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        countDownLatch.countDown();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    System.out.printf("线程三");
                }
            });
    
            try {
                // 等待所有线程全部释放完成后，再去执行主线程
                countDownLatch.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
    
            System.out.printf("执行完成");
            threadPoolExecutor.shutdown();
     
        }
    
    }