线程池内运行的线程抛异常，线程池会怎么办

final void runWorker(Worker w) {
  Thread wt = Thread.currentThread();
  Runnable task = w.firstTask;
  w.firstTask = null;
  w.unlock(); // allow interrupts
  boolean completedAbruptly = true;
  try {
    while (task != null || (task = getTask()) != null) {
      w.lock();
      if ((runStateAtLeast(ctl.get(), STOP) ||
           (Thread.interrupted() &&
            runStateAtLeast(ctl.get(), STOP))) &&
          !wt.isInterrupted())
        wt.interrupt();
      try {
        beforeExecute(wt, task);
        Throwable thrown = null;
        try {
          task.run();
        } catch (RuntimeException x) {
          thrown = x; throw x;
        } catch (Error x) {
          thrown = x; throw x;
        } catch (Throwable x) {
          thrown = x; throw new Error(x);
        } finally {
          afterExecute(task, thrown);
        }
      } finally {
        task = null;
        w.completedTasks++;
        w.unlock();
      }
    }
    completedAbruptly = false;
  } finally {
    processWorkerExit(w, completedAbruptly);
  }
}

private void processWorkerExit(Worker w, boolean completedAbruptly) {
  // 从runWorker方法中传过来的是true，所以这句目前版本中必定会被执行到
  // 作用是将当前线程池中的有效线程数-1，意思也就是出现异常的线程会被从线程池中拿掉
  // 为什么说是出现异常的线程会被拿掉呢？因为在try内部是一个while循环，除非关闭核心线程或运行中线程出现异常，否则不会执行到这里
  if (completedAbruptly)
    decrementWorkerCount();
  final ReentrantLock mainLock = this.mainLock;
  mainLock.lock();
  try {
    // 更新完成的任务数，只要是被线程池线程执行过的，不管是否出现异常，都被认为是执行成功的任务
    completedTaskCount += w.completedTasks;
    // 将当前Worker线程从线程池中移除销毁
    workers.remove(w);
  } finally {
    mainLock.unlock();
  }
  tryTerminate();
  // 一系列判断，主要是判断是否符合给线程池创建新的线程
  int c = ctl.get();
  if (runStateLessThan(c, STOP)) {
    if (!completedAbruptly) {
      int min = allowCoreThreadTimeOut ? 0 : corePoolSize;
      if (min == 0 && ! workQueue.isEmpty())
        min = 1;
      if (workerCountOf(c) >= min)
        return;
    }
    // 给线程池创建新的线程，core之所以传递false，是因为这里要防止创建失败
    addWorker(null, false);
  }
}

public static void main(String[] args) {
  ThreadPoolExecutor pool = new ThreadPoolExecutor(2, 5, 10, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>(30));
  for (int i = 0; i < 10; i++) {
    int finalI = i;
    Thread t = new Thread(() -> {
      System.out.println(10 / finalI - 5);
    });
    pool.execute(t);
  }
}

public static void main(String[] args) {
  ThreadPoolExecutor pool = new ThreadPoolExecutor(2, 5, 10, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>(30));
  for (int i = 0; i < 10; i++) {
    int finalI = i;
    Thread t = new Thread(() -> {
      System.out.println(10 / finalI - 5);
    });
    try {
      pool.execute(t);
    } catch (Exception e) {
      System.out.println("发生了异常");
    }
  }
}

Worker(Runnable firstTask) {
  setState(-1); // inhibit interrupts until runWorker
  this.firstTask = firstTask;
  // 调用ThreadFactory的newThread方法创建线程
  this.thread = getThreadFactory().newThread(this);
}
在构造方法中调用线程工厂的newThread()方法创建运行线程，我们上面通过ThreadPoolExecutor的构造方法创建线程池时并未传入ThreadFactory参数，那么就会使用默认的Executors.defaultThreadFactory()来创建线程，它的实现逻辑如下：
public Thread newThread(Runnable r) {
  Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
  if (t.isDaemon())
    t.setDaemon(false);
  if (t.getPriority() != Thread.NORM_PRIORITY)
    t.setPriority(Thread.NORM_PRIORITY);
  return t;
}

public static void main(String[] args) {
  ThreadPoolExecutor pool = new ThreadPoolExecutor(2, 5, 10, TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>(30), r -> {
                    Thread t = new Thread(r);
                    t.setUncaughtExceptionHandler((t1, e) -> System.out.println("发生了异常"));
                    return t;
    });
  for (int i = 0; i < 10; i++) {
    int finalI = i;
    Thread t = new Thread(() -> {
      System.out.println(10 / finalI - 5);
    });
    pool.execute(t);
  }
}