關閉執行緒池
程式碼如下：

public class ClosePoolTest {
    public static final Logger LOG = LoggerFactory.getLogger(ClosePoolTest.class);

    public static void main(String[] args) {

        ExecutorService pool = Executors.newFixedThreadPool(10);
        final long waitTime = 5 * 1000;
        final long awaitTime =
 
 5 * 1000;

        Runnable task1 = new Runnable() {
            public void run() {
                try {
                    LOG.info("task1 start");
                    Thread.sleep(waitTime);
                    LOG.info("task1 end");
                } catch (InterruptedException e) {
                    LOG
 
.error("task1 interrupted: [{}]", e.getMessage());
                }
            }
        };

        Runnable task2 = new Runnable() {
            public void run() {
                try {
                    LOG.info("  task2 start");
                    Thread.sleep(1000);
                    LOG.info
 
("  task2 end");
                } catch (InterruptedException e) {
                    LOG.error("task2 interrupted: [{}]", e.getMessage());
                }
            }
        };

        long start = System.nanoTime();
        // 讓學生解答某個很難的問題
        pool.execute(task1);

        // 生學生解答很多問題
        for (int i = 0; i < 50; ++i) {
            pool.execute(task2);
        }

//        pool.shutdown();

        try {
            // 向學生傳達“問題解答完畢後請舉手示意！”
            pool.shutdown();

            // 向學生傳達“XX分之內解答不完的問題全部帶回去作為課後作業！”後老師等待學生答題
            // (所有的任務都結束的時候，返回TRUE)
            if (!pool.awaitTermination(awaitTime, TimeUnit.MILLISECONDS)) {
                // 超時的時候向執行緒池中所有的執行緒發出中斷(interrupted)。
                pool.shutdownNow();
            }
        } catch (InterruptedException e) { //InterruptedException
            // awaitTermination方法被中斷的時候也中止執行緒池中全部的執行緒的執行。
            System.out.println("awaitTermination interrupted: " + e);
            pool.shutdownNow();
        }

        System.out.println("end");
        // 執行時間
        System.out.println((System.nanoTime() - start) / 1000000 + "msces");
    }
}

原文請檢視：
(https://blog.csdn.net/alinshen/article/details/78090043)