help me with JFrame and JLabel

[michcio]

hello!
I have been trying, with some friends help, for a couple of days now to make a "countdown" program. The main point of this program was to see a time running down in a window. I have tried to make my own window with JFrame and successed. (I have done a new label and everything) But now the problem is how to get the label updated so I can see the time "running" down. I have tested with "setText" from the main platform JLabel but I have not succesed. Maybe the foult is that I use a Calendar platform from java.util to count how much time it's left.
I realy need help with this problem.
Ty... Michal

[michcio]

here is my program:


package minapplikation;
import java.util.*;
import javax.swing.*;
import java.awt.*;
public class countdown {

public static void main(String [] arg)
throws Exception{
String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000);
if (ids.length == 0)
System.exit(0);

SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);
Calendar calendar = new GregorianCalendar(pdt);
Date trialTime = new Date();
JLabel emptyLabel = new JLabel();

int a = calendar.get(Calendar.DAY_OF_YEAR);
int dagarkvar = 0;
if(a>50)
dagarkvar = 402-a;
else
dagarkvar = 46-a;

int b = calendar.get(Calendar.HOUR) + 9;

int c = calendar.get(calendar.MINUTE);

int d = calendar.get(Calendar.SECOND);

int timmarkvar = 24 - b;
int minkvar = 60 - c;
int sekkvar = 60 - d;

JFrame frame = new JFrame("LOST");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);

for(int i=0; i<=3; i++){
emptyLabel.setText(" tid kvar till LOST: " + dagarkvar + " dagar, " + timmarkvar +
" timmar, " + minkvar + " minuter, " + sekkvar + " sekunder ");

SwingUtilities.updateComponentTreeUI(emptyLabel);
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}

}
}

[hardwired]

Code:

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

public class CountdownRx implements Runnable {
    JLabel emptyLabel;
    SimpleTimeZone pdt;

    private void start() {
        Thread thread = new Thread(this);
        thread.setPriority(Thread.NORM_PRIORITY);
        thread.start();
    }

    public void run() {
        while(true) {
            try {
                Thread.sleep(500);
            } catch(InterruptedException e) {
                break;
            }
            updateLabel();
        }
    }

    private void updateLabel() {
        Calendar calendar = new GregorianCalendar(pdt);
        Date trialTime = new Date();

        int a = calendar.get(Calendar.DAY_OF_YEAR);
        int dagarkvar = 0;
        if(a>50)
            dagarkvar = 402-a;
        else
            dagarkvar = 46-a;

        int b = calendar.get(Calendar.HOUR) + 9;

        int c = calendar.get(calendar.MINUTE);

        int d = calendar.get(Calendar.SECOND);

        int timmarkvar = 24 - b;
        int minkvar = 60 - c;
        int sekkvar = 60 - d;

        emptyLabel.setText(" tid kvar till LOST: " + dagarkvar +
                           " dagar, "   + timmarkvar +
                           " timmar, "  + minkvar +
                           " minuter, " + sekkvar + " sekunder ");
    }

    private JLabel getLabel() {
        String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000);
        if (ids.length == 0)
            System.exit(0);
        pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);
        emptyLabel = new JLabel();
        return emptyLabel;
    }

    public static void main(String[] arg) throws Exception{ 
        CountdownRx test = new CountdownRx();
        JFrame frame = new JFrame("LOST");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(test.getLabel(), BorderLayout.CENTER);
        frame.setSize(400,125);
        frame.setVisible(true);
        test.start();
    }
}

[michcio]

hum I have tried to compile the prog. that you have send. It compiled without errors but when I'm trying to run it one appears:

java.lang.NoClassDefFoundError: minapplikation/CountdownRx
Exception in thread "main"
Java Result: 1

[hardwired]

minapplikation/CountdownRx
I didn't put a package statement in the class I posted.

[michcio]

oh how stupid of me I missed it... and it works now ty very very much for help