Help with GUI Java

[Eric]

Hi, I am trying to make a simple java program which acts as a shop register.
The user is able to click on a cd and select to buy it.
I am having major problems learning java and cannot find anyway for forms to navigate from one to another. Is it even possible?
Are there any programs which work as a GUI creation as a tool which may help me?

Thanks.
Eric

[Albert]

Have you written any code?

Also, is this a Java application or JSP (Java Server Pages)?
You said forms, so I just want to clarify.

I think Netbeans (the IDE) has a feature where you can do a sort of "GUI Creation" but I'm unsure, as I'm typically an Eclipse only user.

Greetings
Albert

[Daniel]

Hello, I have created a quick example that demonstrates how you could create more than one JFrame in the same class.

Depending on your particular requirements...it might be better to create a class for each frame though...as that would make it easier when performing maintenance etc.

Code:

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

public class MyApp {
    private JFrame first,         // first Jframe instance
                   second,        // second Jframe instance 
                   third;        // third Jframe instance
    private JButton openFirst,    // opens second jframe
                    openSecond;    // open third jframe 
    
    private final int WIDTH = 400;    // first frame's width
    private final int HEIGHT = 200;    // second frame's height
    
    public MyApp() {
        // create and initilize the first frame...first being the main one
        this.first = new JFrame( "First Frame" );
        this.first.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        
        // initialize components 
        this.initComponents();
        
        // place the first frame in the center of the screen
        this.first.setLocation(
            ( Toolkit.getDefaultToolkit().getScreenSize().width - WIDTH ) / 2, 
            ( Toolkit.getDefaultToolkit().getScreenSize().height - HEIGHT ) / 2
            );
        // set frame size
        this.first.setSize( WIDTH, HEIGHT );
        this.first.setVisible( true ); // make it visible
    } //-- ends class constructor
    
    private void initComponents() {
        // this method takes care of initializing and
        // adding comonents to the first frame
        Container pane = this.first.getContentPane();
        FlowLayout layout = new FlowLayout();
        pane.setLayout( layout );
        
        // initialize the first button to open the first frame
        this.openFirst = new JButton( "Open First Dialog" );
        this.openFirst.addActionListener(
            new ActionListener() {
                public void actionPerformed( ActionEvent event ){
                    openFirst_clicked( event );
        }});
        pane.add( this.openFirst );        
        
        this.openSecond = new JButton( "Open Second Dialog" );
        this.openSecond.addActionListener(
            new ActionListener() {
                public void actionPerformed( ActionEvent event ) {
                    openSecond_clicked( event );
        }});
        pane.add( this.openSecond );    
    } //-- ends instance method initComponents
    private void openFirst_clicked( ActionEvent event ) {
        this.second = new JFrame( "Second Frame" );
        this.second.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
        this.second.getContentPane().setLayout( new FlowLayout() );
        this.second.getContentPane().add( new JLabel("Hello from second frame" ) );
        this.second.setSize( 250, 100 );
        this.second.setVisible( true );
    } //-- ends instance method openFirst_clicked
    
    private void openSecond_clicked( ActionEvent event ) {
        this.third = new JFrame( "Third Frame" );
        this.third.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
        this.third.getContentPane().setLayout( new FlowLayout() );
        this.third.getContentPane().add( new JLabel("Hello from third frame" ) );
        this.third.setSize( 250, 100 );
        this.third.setVisible( true );
    } //-- ends instance method openFirst_clicked
    
    public static void main( String [] args ) {
        SwingUtilities.invokeLater(
            new Runnable() {
                public void run() {
                    new MyApp();
        }});
    } //-- ends class method main
    
} //-- ends class definition

Greetings
Daniel