Question

我在这里有下面的代码，我试图通过使用计时器每秒执行整个程序，但它只被调用一次。我首先通过命令提示符调用下面的程序。你能帮帮我吗？

import java.util.Timer;
import java.util.TimerTask;

public class Task3 {
    public static void main(String[] args)  {
        final  Timer timer = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                // task to run goes here
                System.out.println("Hello !!!");
                try {
                    dog677_Copy.main(new String[0]);
                    try {
                        Thread.sleep(1000);                 //1 min .
                    }
                    catch(InterruptedException ex) {
                        Thread.currentThread().interrupt();
                    }
                    trm.main(new String[0]);
                    tstnew.main(new String[0]);

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

                } catch (Exception ex) {
                    // handle the exception,
                    // in this case by throwing a RuntimeException with ex as cause
                    throw new IllegalStateException("I didn't expect a exception.", ex);
                }
            }
        };

        long delay = 0;
        long intevalPeriod = 1 * 240000;

        // schedules the task to be run in an interval 
        // timer.scheduleAtFixedRate(task, delay,intevalPeriod);
        timer.schedule(task, 0, 1000);

        System.out.println("Hello !!!");
    } // end of main
}

Answer 1

您应该从timer.cancel()方法移除run()。根据{{1}}方法的API documentation：

请注意，在计时器的run方法中调用此方法这个计时器调用的任务绝对保证了正在进行的任务执行是最后一次执行任务由此计时器执行。

程序本身不会调用java程序

1 个答案: