我想做的基本上是创建一个计时器,它可以在x秒后运行一个特定的TimerTask,但是TimerTask可以重新安排计时器在y秒后执行任务。下面是一个示例,它在我尝试在TimerTask中调度此任务的行上给出了错误“Exception in thread "Timer-0" java.lang.IllegalStateException:Task already scheduled or cancelled”。
import java.util.Timer;
import java.util.TimerTask;
public class JavaReminder {
public JavaReminder(int seconds) {
Timer timer = new Timer();
timer.schedule(new RemindTask(timer, seconds), seconds*2000);
}
class RemindTask extends TimerTask {
Timer timer;
int seconds;
RemindTask(Timer currentTimer, int sec){
timer = currentTimer;
seconds = sec;
}
@Override
public void run() {
System.out.println("ReminderTask is completed by Java timer");
timer = new Timer();
timer.schedule(this, seconds*200);
System.out.println("scheduled");
}
}
public static void main(String args[]) {
System.out.println("Java timer is about to start");
JavaReminder reminderBeep = new JavaReminder(2);
System.out.println("Remindertask is scheduled with Java timer.");
}
}