TimerTask定时任务与Timer

package org.test3;

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

public class ManyProject {
    private static Timer timer = new Timer();
    private static TimerTask timerTask = null;

    public static void endTask(String s) {
        timerTask.cancel();
        timerTask = null;//想要再次启动定时此处是关键
        System.out.println(s);
    }

    public static void startTask(String s) throws InterruptedException {
        if (timerTask == null) {
            timerTask = new Task1().getTask1();
        }
        timer.schedule(timerTask, 3000, 2000);
    }

    public static void main(String[] args) throws InterruptedException {
        startTask("启动");

        Thread.sleep(6000);
        endTask("结束");
        startTask("再次启动");

    }

}
class Task1 {

    public TimerTask getTask1() {
        return new TimerTask() {
            @Override
            public void run() {
                System.out.println("kkkkkk");
            }
        };
    }
}