我正在运行一个有线程的程序，让它们休眠一段随机的时间，然后再唤醒它们。当程序运行到末尾时，它会打印出最后一个线程已经唤醒了6次。它不会在其他线程上这样做。有人知道它为什么这样做吗？
sampleThread.java

import java.util.Random;

public class sampleThread extends Thread{
    sampleThread thread;
    Random rand = new Random();

    public void run() {

        thread = new sampleThread();
        int randSleep = rand.nextInt(1000);

        System.out.println(thread.getName() + " is sleeping for " + randSleep + " milliseconds");

        try {
            Thread.sleep(randSleep);
            System.out.println(thread.getName() + " is NOW AWAKE");

        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }

    }

}

driver.java

public class driver {

    public static void main(String[] args) throws ExecutionException, InterruptedException {

        List<Future<?>> futArray = new ArrayList<>();
        ExecutorService es = Executors.newFixedThreadPool(6);

        sampleThread temp = new sampleThread();
        for (int i=0; i<120; i++) {
            Future<?> future = es.submit(temp);
            futArray.add(future);
        }

输出：

Thread-117 is sleeping for 547 milliseconds
Thread-117 is NOW AWAKE
Thread-118 is sleeping for 442 milliseconds
Thread-118 is NOW AWAKE
Thread-119 is sleeping for 182 milliseconds
Thread-119 is NOW AWAKE
Thread-120 is sleeping for 487 milliseconds
Thread-120 is NOW AWAKE
Thread-120 is NOW AWAKE
Thread-120 is NOW AWAKE
Thread-120 is NOW AWAKE
Thread-120 is NOW AWAKE
Thread-120 is NOW AWAKE

我期望它只是运行和打印时，每个人都在睡觉和完成。相反，它打印最后一个线程几次。

编辑：

如果有人想知道，我改变了

public class sampleThread extends Thread{
sampleThread thread;
Random rand = new Random();

public void run() {

    thread = new sampleThread();

我没有把sampleThread thread;放在run（）之外，把thread = new sampleThread();放在run（）之内，而是把它们合并成一条sampleThread thread = new sampleThread();语句，然后把整行放在run中，这样似乎就解决了这个问题。