Question

I’m about to learn the java threading facility.

I have 2 classes:

public class Main {
    public static void main(String[] arg) throws Exception {

        Timer timer = new Timer();
        timer.schedule(new ExecuteTimer(Thread.currentThread()), 2000);

        try {
            Thread.currentThread().join();
        } catch (InterruptedException ex) {
            System.out.println("timer stopped");
        }
        System.out.println("try block executed");
    }
}

and the timer class:

public class ExecuteTimer extends TimerTask {
    public ExecuteTimer(Thread thread) {
        creatingThread = thread;
    }
    private Thread creatingThread;

    @Override
    public void run() {
        System.out.println("I'm executed!");
        creatingThread.interrupt();

    }

}

When I debug the code. I have following output:

I'm executed!
timer stopped
try block executed

Everything seems to be final except the app didn’t exit after I have the output above. The eclipse remain in debug mode and no exception has been thrown.

Answer 1

After you no longer need the Timer to run tasks, you should call timer.cancel() to release its thread.