Making a java based program

onyxgem

Jun 26 2007, 03:42 AM

Java GUI

Making a Little Java Program

Sec. 1: Imports and starting it off
Sec. 2: Variables
Sec. 3: Frame and Stuff
Sec. 4: Declaring buttons
Sec. 5: Adding buttons
Sec. 6: Action Listening
Sec. 7: Using this for a learning experience

Section 1

Now, let's think. What imports do we need? We obviously need GUI imports. We also need the action Listener. So,
let's declare this at the very top:

Code:

CODE

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

That's all we need to get all our supplies. Now to start us off.
Skip a couple lines and add:

Code:

CODE

public class Tutorial extends JFrame implements ActionListener
{

Section 2

Let's declare our variables.
Right below the class, add

Code:

CODE

private static Tutorial frame;
private static JTextField text;

I will tell you about this later.

Section 3

This is in all java programs. To start it and load everything, you must add:

Code:

CODE

public static main(String[] args)
{

We must now add the frame, so skip a 2 lines and add:

Code:

CODE

frame = new Tutorial();
          frame.setTitle("Tutorial of GUI");
          frame.setSize(400, 100);
          frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
          frame.setVisible(true);

Ending the statement, add one last "}"

Section 4

Now add:

Code:

CODE

public Tutorial()
{Next add:

Code:

CODE

setLayout(new BorderLayout());

              JTextField text = new JTextField(10);
              JButton button = new JButton("JButton1");
              JButton button1 = new JButton("JButton2");
              JButton button2 = new JButton("JButton3");
              JButton button3 = new JButton("JButton4");

              JPanel panel = new JPanel();

That adds the button vars.

Section 5

Let's add the buttons now. Add right below that, add:

Code:

CODE

panel.setLayout(new FlowLayout());

              panel.add(button);
              panel.add(button1);
              panel.add(button2);
              panel.add(button3);

       add(panel, BorderLayout.NORTH);
          button.addActionListener(this);
           button1.addActionListener(this);
            button2.addActionListener(this);
             button3.addActionListener(this);
         }

That adds the buttons on.

Section 6

Let's make the outcome of clicking the button. Add:

Code:

CODE

public void actionPerformed(ActionEvent e)
          {

           JOptionPane.showMessageDialog(frame, " was selected." );

          }
     }That tells you what button was selected.

Now save and compile. Now run the program and see what the outcome is.

Section 7

You can view other things like this at:
http://java.sun.com/developer/online.....;/contents.html
This will help you understand all the functions of java GUI.

-Bill for Unkn

note:i copied this from my word and pasted it here hope this helps ya out im sorry if i misspelled anything i type fast

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alex7h3pr0gr4m3r

Jun 27 2007, 04:55 PM

Great tutorial! I still hate java though. I remember learning gui in java about four years ago, and it was hell for me. This probably would have made it a bit easier but I much prefer c++ to java when making gui applications. Anyway great tut! Keep up the good work!

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zak92

Jun 29 2007, 06:47 AM

These languages confuse me but at the same time fascinate me as some gibberish can turn into such good creation such as a great and a profitable web site. Thanks man love you as I wanted to just learn this.

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master_bacarra

Jun 29 2007, 11:32 AM

the reason why i like java more is because i could just use the exception handling for the errors. but i have to admit i'm not a great programmer at all. i never really appreciated c/c++ because of the complicated pointers. programming with pointers was hell for me.

anyways, great tutorial for starters.

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