在java中重启计时器 [英] restart timer in java

问题描述

我想做一个计时器，当事情发生时它会重新启动：

I would like to do a timer, it will be restarted when something happens:

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); 
}  

我在创建新计划时遇到问题，我有这样的错误：

I have a problem when I create the new schedule, I have this error:

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)

我不知道怎么办！谢谢！

I don't know how can I do it! Thanks!

推荐答案

这对我来说很好...你能粘贴完整的代码和错误吗？

This works fine for me... can you paste the full code and error?

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);
    }
}

此输出：

 MAC: 123ipAddress:127.0.0.1
 Updated timer

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