TimerUtils allows to start a timer

TimerUtils.java

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

public class TimerUtils {
    private TimerTask timerTask;
    private Timer timer;
    private Action action;

    public void start(Action action, int delay) {
        this.action = action;
        if (timer != null) {
            timer.cancel();
            timerTask.cancel();
        }
        timer = new Timer();
        timerTask = new CustomTimerTask();
        timer.schedule(timerTask, delay);
    }

    public void stop() {
        if (timer != null) {
            timer.cancel();
            timerTask.cancel();
            timer.purge();
        }

        timer = null;
        timerTask = null;
        action = null;
    }

    public void safeStop() {
        if (timer != null) {
            timer.cancel();
            timerTask.cancel();
            timer.purge();
        }

        if (action != null) {
            action.invoke();
        }

        timer = null;
        timerTask = null;
        action = null;
    }

    private class CustomTimerTask extends TimerTask {
        @Override
        public void run() {
            if (action != null) {
                action.invoke();
            }
        }
    }

    public interface Action {
        void invoke();
    }
}