java threadpoolexecutor 判断线程全部结束

判断线程池中所有线程是否执行完毕

1.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");
            }
        }
    }
}

2.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");
    }
}