# Java实战系列 - 线程池中的线程出现异常

问题：线程池中的线程执行任务出现异常，该线程接下来的命运如何？

结论：线程会结束，线程池会新建线程替换该线程

验证：编码验证，代码如下

public class ThreadPoolExceptionTest {

    // 创建一个核心线程数、最大线程数都为1的线程池，任务队列最大容量为10
    private static ThreadPoolExecutor executor = new ThreadPoolExecutor(1, 1,
            0L, TimeUnit.SECONDS,
            new ArrayBlockingQueue<>(10),
            new java.util.concurrent.ThreadPoolExecutor.DiscardPolicy());

    public static void main(String[] args) {

        executor.execute(() -> System.out.println(Thread.currentThread().getName() + " " + (1 / 0)));
        try {
            // 睡眠1秒，让打印结果更明显
            Thread.sleep(1000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        executor.execute(() -> System.out.println(Thread.currentThread().getName() + " " + (1 / 1)));
        executor.execute(() -> System.out.println(Thread.currentThread().getName() + " " + (1 / 2)));
        executor.execute(() -> System.out.println(Thread.currentThread().getName() + " " + (1 / 3)));
        executor.execute(() -> System.out.println(Thread.currentThread().getName() + " " + (1 / 4)));

    }
}

• 打印日志如下：

Exception in thread "pool-1-thread-1" java.lang.ArithmeticException: / by zero
    at com.lushwe.thread.ThreadPoolExceptionTest.lambda$main$0(ThreadPoolExceptionTest.java:25)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
pool-1-thread-2 1
pool-1-thread-2 0
pool-1-thread-2 0
pool-1-thread-2 0

• 总结：通过日志线程的线程名称可知，线程执行任务出现异常，该线程会结束，线程池会创建新的线程替换该线程执行其他任务。

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本文完。