Re: Help with my first Java program

From:

Mohammad Abou-Basha <midoladido@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 29 Dec 2007 20:05:05 -0800 (PST)

Message-ID:

<4dc922ec-bbc1-448f-96b4-bb9d4a2eb308@s19g2000prg.googlegroups.com>

Check that page for the jar thing
http://www.wikicodia.com/wiki/Java_Create_executable_jar_file

On Dec 27, 3:53 pm, mohed.hai...@gmail.com wrote:

Hello guys. I just wrote my first java program and i have a couple of
questions and a problem. I would be glad if someone can give me a
hand.

The questions :
  1. How do i pack everything into i nice executable file for others
to run without the need to open a cmd prompt and typing java ... and
so on ?
  2. How do you guys do when your looking for a command. Is there some
kind of registry online, or do you have books or do you just know it
all from the getgo :) ?

The problem is that, while the compailer doesn't complain, i still get
an error at runtime. The error staits

Exception in thread "main" java.lang.NullPointerException
        at DiveLog.DiveLog.populateMettoMenu(DiveLog.java:76)
        at DiveLog.DiveLog.<init>(DiveLog.java:38)
        at DiveLog.DiveLog.main(DiveLog.java:15)
Press any key to continue . . .

and i cant get the program running.

The source looks like this

package DiveLog;

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

public class Metto
{
        private JFrame mettoFrame;
        private JTabbedPane mettoPane;

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

        public Metto()
        {

                JFrame mettoFrame = new JFrame("Metto ligger l=E5ngt eft=

er");

                mettoFrame.addWindowListener(new WindowAdapter()
                {
                        public void windowClosing(WindowEvent e)
                        {
                                System.exit(0);
                        }
                });

                mettoPane = new JTabbedPane(SwingConstants.RIGHT);
                mettoPane.setBackground(Color.blue);
                mettoPane.setForeground(Color.white);
                populateMettoPane();

                populateMettoMenu();

                mettoFrame.getContentPane().add(mettoPane);

                mettoFrame.pack();
                mettoFrame.setSize(750, 650);
                mettoFrame.setBackground(Color.white);
                mettoFrame.setVisible(true);

        }

        private void populateMettoPane()
        {
                mettoPane.addTab("Tryck h=E4r",
                                                 null,
                                                 new press1(),
                                                 "Det h=E4r va inte s=E5 s=

v=E5rt");

                mettoPane.addTab("Eller h=E4r",
                                                 null,
                                                 new press2(),
                                                 "Inte det h=E4r h=E4ller"=

);

        }

        private void populateMettoMenu()
        {
                JMenuBar mb = new JMenuBar();
                JMenu menu = new JMenu("File");
                JMenuItem item = new JMenuItem("Exit");
                item.addActionListener(new ActionListener()
                {
                        public void actionPerformed(ActionEvent e)
                        {
                                System.exit(0);
                        }
                });
                menu.add(item);
                mb.add(menu);
                mettoFrame.setJMenuBar(mb);

        }

        public class press1 extends JPanel
        {
        }

        public class press2 extends JPanel
        {
        }

}

Thx in advance for any help you guys can give me. Mohamed Haidar.