ScheduledExecutorService:如何等待所有任务完成，然后执行更多任务

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class Example {
    public static void main(String[] args) throws InterruptedException {
        int taskCount = 5; // 任务数量
        CountDownLatch latch = new CountDownLatch(taskCount); // 创建CountDownLatch，初始计数为任务数量

        ScheduledExecutorService executor = Executors.newScheduledThreadPool(taskCount); // 创建ScheduledExecutorService

        // 提交任务
        for (int i = 0; i < taskCount; i++) {
            executor.schedule(new Task(latch), i, TimeUnit.SECONDS);
        }

        latch.await(); // 等待所有任务完成

        // 执行更多任务
        System.out.println("All tasks completed. Do more tasks...");
        
        executor.shutdown(); // 关闭ScheduledExecutorService
    }

    static class Task implements Runnable {
        private CountDownLatch latch;

        public Task(CountDownLatch latch) {
            this.latch = latch;
        }

        @Override
        public void run() {
            try {
                // 模拟任务执行
                Thread.sleep(1000);
                System.out.println("Task completed");
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                latch.countDown(); // 任务完成，计数减一
            }
        }
    }
}