如何判断线程池中所有线程是否执行完毕

最新推荐文章于 2025-07-18 15:28:47 发布

转载最新推荐文章于 2025-07-18 15:28:47 发布 · 409 阅读

本文介绍两种判断Java线程池中所有任务是否执行完毕的方法：一是通过比较线程池的任务总数与已完成任务数；二是利用ExecutorService的shutdown()与awaitTermination()方法等待所有任务结束。

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1.判断线程池中所有线程是否执行完毕

根据线程池中的总线程数目等于完成的线程数目


package com.luna.thread;
import java.util.Random;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class ThreadsIsDone {
	public static void main(String[] args) {
		// 创建一个10个线程的线程池
		ThreadPoolExecutor pool = new ThreadPoolExecutor(10, 10, 0L, TimeUnit.MILLISECONDS,
				new LinkedBlockingQueue<Runnable>());
 
		for (int i = 0; i < 10; i++) {
			pool.submit(new Runnable() {
				public void run() {
				System.out.println(
		                "当前线程:" + Thread.currentThread().getName() + ",打印随机数:" + new Random().nextInt(1000));
				}
			});
		}
		System.out.println("pool.getTaskCount():" + pool.getTaskCount());
		System.out.println("pool.getCompletedTaskCount():" + pool.getCompletedTaskCount());
		//当线程池完成的线程数等于线程池中的总线程数
		boolean allThreadsIsDone = pool.getTaskCount() == pool.getCompletedTaskCount();
		System.out.println(allThreadsIsDone);
		if (allThreadsIsDone) {
			System.out.println("全部执行完成");
		}
		while (!allThreadsIsDone) {
			allThreadsIsDone = pool.getTaskCount() == pool.getCompletedTaskCount();
			if (allThreadsIsDone) {
				System.out.println("全部执行完成");
			}
		}
	}
}

当调用ExecutorService的shutdown()和awaitTermination()


package com.luna.thread;
import java.util.Random;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class ThreadDone {
	public static void main(String[] args) {
		// 创建一个10个线程的线程池
		ThreadPoolExecutor pool = new ThreadPoolExecutor(10, 10, 0L, TimeUnit.MILLISECONDS,
				new LinkedBlockingQueue<Runnable>());
		for (int i = 0; i < 10; i++) {
			pool.submit(new Runnable() {
				public void run() {
				System.out.println(
				"当前线程:" + Thread.currentThread().getName() + ",打印随机数:" + new Random().nextInt(1000));
				}
			});
		}
		pool.shutdown();
		try {
			pool.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("all thread complete");
	}
}