[英]How to stop a running TimerTask
我正在尝试制作一个简单的计时器,在指定的秒数后播放哔声。 我设法让它工作,但 TimerTask 在哔声后继续运行。 现在我要停止执行吗? 这是我的代码:
import java.util.Scanner;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.Toolkit;
class Alarm {
public static void main(String[] args) {
long delay;
Scanner scan = new Scanner(System.in);
System.out.print("Enter a delay in seconds: ");
delay = scan.nextInt()*1000;
Timer timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
Toolkit.getDefaultToolkit().beep();
}
};
timer.schedule(task, delay);
}
}
您需要通过调用以下方法取消计时器
timer.cancel(); // Terminates this timer, discarding any currently scheduled tasks.
timer.purge(); // Removes all cancelled tasks from this timer's task queue.
这将取消任务,所以这样的事情会起作用:
import java.util.Scanner;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.Toolkit;
class Alarm {
private static boolean run = true;
public static void main(String[] args) {
long delay;
Scanner scan = new Scanner(System.in);
System.out.print("Enter a delay in seconds: ");
delay = scan.nextInt()*1000;
final Timer timer = new Timer();
final TimerTask task = new TimerTask() {
@Override
public void run() {
if(run) {
Toolkit.getDefaultToolkit().beep();
} else {
timer.cancel();
timer.purge();
}
}
};
timer.schedule(task, delay);
// set run to false here to stop the timer.
run = false;
}
}
这对我有用(也使用了 purge() 建议):
import java.util.Scanner;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.Toolkit;
class Alarm {
public static void main(String[] args) {
long delay;
Scanner scan = new Scanner(System.in);
System.out.print("Enter a delay in seconds: ");
delay = scan.nextInt()*1000;
final Timer timer = new Timer();
final TimerTask task = new TimerTask() {
@Override
public void run() {
Toolkit.getDefaultToolkit().beep();
timer.cancel();
timer.purge();
}
};
timer.schedule(task, delay);
}
}
cancel()
应该这样做 - cancel
停止取消给定的TimerTask
/ Timer
isStart = true; // 如果调用了真正的定时器函数 countiue ,否则时间被取消
定时器 timer = new Timer(); timer.schedule(new TimerClass(), 0, 5000);
class TimerClass extends TimerTask {
public void run() {
if (isStart) {
yourFunction();
}else {
cancel();
}
}
}
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