java - 如何在 Java 中停止 TimerTask

Question

我用Java实现了一个TimerTask，我需要在一段时间后停止线程:

        .... 
        timer = new Timer(); // At this line a new Thread will be created

        TimerTask timerTask = new TimerTask() {

            int tweetCounter = 0;
            String message;

            @Override
            public void run() {
                try {
                    while ((message = reader.readLine()) != null && (tweetCounter < 100)) {
                        bucket.add(message);
                        tweetCounter++;

                        out.println("Number of messages: " + tweetCounter);
                        out.println("Nano Time: " + System.nanoTime());

                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };
        timer.schedule(timerTask, 30000);
        ......

此时我尝试:

    timerTask.cancel();
    timer.cancel();
    timer.purge();

此后什么也没有发生，程序也永远不会退出。如何停止 TimerTask 线程？

Answer 1

timer.cancel();
timer.purge();

会起作用的。

int java.util.Timer.purge()

Removes all canceled tasks from the task queue. If there are no other references on the tasks, then after this call they are free to be garbage collected.

Returns: the number of canceled tasks that were removed from the task queue.