need help on java timer

edzas

hi i am still a noob in java and i need to make a timer whit gui interface that when the time runs out it will close an application any help would be greatly appreciated tnx.

henryporter

So what does the GUI do; alow you to input a time for countdown, show the countdown or what?

For Timer look here: http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Timer.html

It's simply a matter of putting the time on screen and then updating it with the timer counting down (multiplied by 1000 as its in milliseconds), then when the timer hits zero call System.exit()

Kidchameleon

Very quick uncommented throw together of this. May help.

Use the timer class to get accurate timing.

Put a JTextField and a JButton on the frame to allow the user to set their own time.

import java.util.*;
import javax.swing.*;
import java.awt.*;

public class Timer extends JFrame
{
    private JLabel numbers;
    private int time;
    boolean progOver;
    
    public static void main(String[] args)
    {
        Timer prog = new Timer();
        prog.go();
    }
    
    public void go()
    {
        time = 60;
        numbers = new JLabel();
        progOver = false;
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(350, 500);
        setVisible(true);
        getContentPane().setLayout(null);
        
        Font aFont = numbers.getFont();
        numbers.setFont(new Font(aFont.getFontName(), aFont.getStyle(), 50));
        numbers.setBounds(100, 130, 2000, 40);
        
        getContentPane().add(numbers);
        
        long startTime = 0;
        long endTime = 0;
        
        while(!progOver)
        {
            numbers.setText("Time: " + time);
            
            startTime = System.currentTimeMillis() / 1000;
            
            //decrease the timer every second
            if(startTime != endTime)
            {
                time--;
            }
            
            repaint();
            
            endTime = System.currentTimeMillis() / 1000;
            
            if(time <= 0)
            {
                progOver = true;
            }
        }
        
        System.exit(0);
    }
}

Another way you could do it is by using thread (a mini process), although, I don't know if you know what they are or how they are used. But if you're interested, here is a simple sample

I just modified the code posted above...

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import java.util.*;
import javax.swing.*;
import java.awt.*;

public class Timer extends JFrame {
private JLabel numbers;
private int time;
boolean progOver;

public static void main(String[] args) {
Timer prog = new Timer();
prog.go();
}

public void go() {
time = 60;
numbers = new JLabel();
progOver = false;
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(350, 500);
setVisible(true);
getContentPane().setLayout(null);

Font aFont = numbers.getFont();
numbers.setFont(new Font(aFont.getFontName(), aFont.getStyle(), 50));
numbers.setBounds(100, 130, 2000, 40);

getContentPane().add(numbers);

long startTime = 0;
long endTime = 0;

//create thread
Thread t = new Thread();

//start thread
t.start();

while (!progOver) {
numbers.setText("Time: " + time);

try {
//sleep thread for 1 second. It will never actually be one full second, but if will be very close
t.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}

time--;

repaint();
if (time < 0)
progOver = true;

}

System.exit(0);
}
}
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