如何在ThreadPool中等待任何线程？

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

public class ThreadPoolExample {
    public static void main(String[] args) {
        int threadCount = 5; // 线程数量

        CountDownLatch latch = new CountDownLatch(threadCount);

        ExecutorService executorService = Executors.newFixedThreadPool(threadCount);

        for (int i = 0; i < threadCount; i++) {
            executorService.execute(new WorkerThread(latch));
        }

        try {
            latch.await(); // 等待所有线程完成任务
            System.out.println("所有线程已完成任务");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        executorService.shutdown();
    }

    static class WorkerThread implements Runnable {
        private final CountDownLatch latch;

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

        @Override
        public void run() {
            // 执行任务
            System.out.println("线程" + Thread.currentThread().getId() + "正在执行任务");

            // 模拟任务耗时
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            System.out.println("线程" + Thread.currentThread().getId() + "任务执行完成");
            latch.countDown(); // 任务完成，计数器减1
        }
    }
}