Adding buttons to a JDialog?

I'm trying to make a JButton on a JDialog, but, the button will cover the entire JDialog, any help on this? This is what it looks like:

This is how I create the JDialog and the JButton:

class MenuStoreHandler implements ActionListener{
    public void actionPerformed(ActionEvent e){

        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
        int screenWidth = (int) dim.getWidth();
        int screenHeight = (int) dim.getHeight();

        JDialog g = new JDialog();
        g.setTitle("The Store");
        g.setSize(200, 200);
        g.setLocation(screenWidth / 2 - 150, screenHeight / 2 - 150);

        JButton b = new JButton("Buy");
        b.addActionListener( new StoreItem1Handler() );
        b.setVisible(true);
        g.add(b);

        g.setVisible(true);
    }
}

I'm just going to post my full MrStan.class, here it is:

package Progress;

public class MrStan extends JPanel{

    private Timer timer = new Timer();
    public static int points;
    static File h = new File("text.txt");
    public ImageIcon bg = new ImageIcon("D:/MrStan/bg.png");
    static JMenuBar menubar;
    Formatter x;
    JMenu menu;
    JMenuItem menuitem;

    double version = 0.3;

    class todoTask extends TimerTask{
        public void run(){ 
            points += 1;
            repaint();
        }
    }

    public int getPoints(){
        return points;
    }

    public void setPoints( int points ){
        this.points = points;
    }

    public MrStan(){
        setIgnoreRepaint(true);

        menubar = new JMenuBar();
        menu = new JMenu("Menu");
        menu.setMnemonic(KeyEvent.VK_F);
        menu.getAccessibleContext().setAccessibleDescription("Menu");
        menubar.add(menu);

        menuitem = new JMenuItem("Store (S)", new ImageIcon("coins.png"));
        menuitem.setMnemonic(KeyEvent.VK_S);
        menuitem.addActionListener( new MenuStoreHandler() );
        menu.add(menuitem);

        menuitem = new JMenuItem("Reset Points (R)", new ImageIcon("delete.png"));
        menuitem.setMnemonic(KeyEvent.VK_R);
        menuitem.addActionListener( new MenuResetPointHandler() );
        menu.add(menuitem);

        // add a separator
        menu.addSeparator();

        menuitem = new JMenuItem("Exit (E)", new ImageIcon("cross.png"));
        menuitem.setMnemonic(KeyEvent.VK_E);
        menuitem.addActionListener( new MenuExitHandler() );
        menu.add(menuitem);

        timer.schedule(new todoTask(), 0, 2000);

    }

    class MenuStoreHandler implements ActionListener{
        public void actionPerformed(ActionEvent e){

            Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
            int screenWidth = (int) dim.getWidth();
            int screenHeight = (int) dim.getHeight();

            JDialog g = new JDialog();
            g.setTitle("The Store");
            g.setSize(200, 200);
            g.setLocation(screenWidth / 2 - 150, screenHeight / 2 - 150);

            JButton b = new JButton("Buy");
            b.addActionListener( new StoreItem1Handler() );
            b.setVisible(true);
            g.add(b);

            g.setVisible(true);
        }
    }

    class StoreItem1Handler implements ActionListener{
        public void actionPerformed(ActionEvent e){
            System.out.println("Store-Button 1 pressed.");
        }
    }

    class MenuExitHandler implements ActionListener{
        public void actionPerformed(ActionEvent e){
            System.exit(1);
        }
    }

    class MenuResetPointHandler implements ActionListener{
        public void actionPerformed(ActionEvent e){
            points = 0;
            repaint();
            JOptionPane.showMessageDialog(null, "Points have been reset.");
        }
    }

    public void paint(Graphics g){
        g.setColor(Color.WHITE);
        bg.paintIcon(this,g,0,0);
        g.setColor(Color.BLACK);
        g.drawString("Points: " + points, 75, 95);
        g.drawString("Version: " + version, 2, 10);
    }

    public static void main(String[] args){

        final MrStanCreateFile g = new MrStanCreateFile();

        Runtime.getRuntime().addShutdownHook(new Thread(new Runnable(){
            public void run(){
                if(h.exists()){
                    g.openFile();
                    g.addRecords();
                    g.closeFile();
                }else{
                    System.out.println(h.getName() + "does not exist, not saving.");
                }
            }
        }, "Shutdown-thread"));

        readIt();

        //Create new JFrame
        JFrame frame = new JFrame();
        frame.setTitle("MrStan");
        frame.setSize(200, 200);
    开发者_开发知识库    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.setJMenuBar(menubar);

        //Set location of JFrame
        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
        int screenWidth = (int) dim.getWidth();
        int screenHeight = (int) dim.getHeight();
        frame.setLocation(screenWidth / 2 - 200, screenHeight / 2 - 200);

        //Set ContentPane to JPanel
        MrStan panel = new MrStan();
        frame.setContentPane(panel);

        //Make the user not be able to resize
        frame.setResizable(false);

        //Make the JFrame visible
        frame.setVisible(true);
    }

    public static void readIt(){
        MrStanReadFile r = new MrStanReadFile();
        r.openFile();
        r.readFile();
        r.closeFile();
    }

}

Why is this covering my ENTIRE JDialog? I'm using the basic Layout Manager, it should just be fine.

Try adding the button to the contentPane first and setting the bounds later.

Container pane = dialog.getContentPane();
pane.setLayout(null);
JButton button = new JButton("Testbutton!");
pane.add(button);
button.setBounds(10,10,40,40);

Seems to work fine for me. Did you do call setLayout(null) for the dialog?

This is what I tried

JDialog dialog = new JDialog();
dialog.setSize(300, 200);
dialog.setLayout(null);



JButton button = new JButton("Testbutton!");
button.setVisible(true);
button.setBounds(10,10,40,40);
dialog.add(button);

//Make dialog visible
dialog.setVisible(true);

And usually it's not a good practice to not use a layout manager. Things can get complicated very quickly. Layout Managers help a lot.

The real problem for you code is that you add the components to the dialog AFTER you set the dialog visible. The second setVisible() does nothing because its already visible.

That is why you should be learning from the examples in the Swing tutorial. The examples show you the proper way to create a simple GUI.