How to make count down timer in Java?

Question

I want count down every second and update the label text?

int countdown = 100;

public void countingDown() {
    countdown = countdown - 1;
    label.setText(countdown + "second's left");
}

so how to run countingDown every second?

Answer 1

You maybe do like this:

package com.example;

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

public class MyTimer {

    public static void main(String[] args) {
        Timer timer = new Timer();
        timer.schedule(new App(), 0, 1000);
    }
}

class App extends TimerTask {

    int countdown = 100;

    public void run() {
        countdown = countdown - 1;
        System.out.println(countdown);
        //label.setText(countdown +"second's left");
    }

}

// Result:
//99
//98
//97
//96
//95
//94

It just works. Change System.out.println(countdown); by label.setText(countdown +"second's left"); as what you want.

Reference
http://docs.oracle.com/javase/8/docs/api/index.html?java/util/TimerTask.html
http://docs.oracle.com/javase/8/docs/api/index.html?java/util/Timer.html