Java中的重启计时器

Question

我想做一个计时器，它会在发生某些事情时重新启动：

public static Timer timer;

public myTimer(long MAC, String ipAddress){
    timer = new Timer();
    timer.schedule(timerTask, 120000); 
}

public void update(){
    timer.cancel();
    timer = new Timer();
    timer.schedule(timerTask, 120000); 
}

创建新时间表时出现问题，出现以下错误：

java.lang.IllegalStateException: Task already scheduled or cancelled
    at java.util.Timer.sched(Timer.java:358)
    at java.util.Timer.schedule(Timer.java:170)
    at spb.keepAliveTimer.update(keepAliveTimer.java:37)
    at spb.keepAlive.update(keepAlive.java:58)
    at spb.receptor.keepAlive(receptor.java:475)
    at spb.receptor.run(receptor.java:118)
    at java.lang.Thread.run(Thread.java:662)

我不知道该怎么办！谢谢！

Answer 1

这对我来说很好用…您可以粘贴完整的代码和错误吗？

package snippet;

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

public class Main {
    public static Timer timer;

    public static void main(String[] args) {
        Main main = new Main();
        main.myTimer(123, "127.0.0.1");


    }

    public void myTimer(final long MAC, final String ipAddress) {
        TimerTask timerTask = new TimerTask() {

            @Override
            public void run() {
                System.out.println("MAC: " + MAC + "ipAddress:" + ipAddress);
                update();
            }
        };
        timer = new Timer();
        timer.schedule(timerTask, 1000);

    }

    public void update() {
        TimerTask timerTask = new TimerTask() {

            @Override
            public void run() {
                System.out.println("Updated timer");

            }
        };
        timer.cancel();
        timer = new Timer();
        timer.schedule(timerTask, 2000);
    }
}

输出：

 MAC：123ipAddress：127.0.0.1
 更新计时器