Question

When I run my code it doesn’t show up.
Basically I have a custom Jcomponent which I add to my JFrame or View and then create a View that makes the frame in my main method.
I already added to JFrame here is my code for the JComponent:

public class CardDisplay extends JComponent {
private Card card;
private Image cardImage;

public CardDisplay()
{
    cardImage = Toolkit.getDefaultToolkit().createImage(("Phase10//res//Blue2.png"));
}

@Override
public void paint(Graphics g)
{
    g.drawImage(cardImage, 125 ,200, this);
}
public class View {
public View(){

}

public void makeFrame()
{
   JFrame frame = new JFrame("Phase 10");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setLayout(new BorderLayout());
   JPanel handPanel = new JPanel();
   CardDisplay cd = new CardDisplay();
   handPanel.setLayout(new FlowLayout());
   frame.add(handPanel, BorderLayout.SOUTH);
   handPanel.add(cd);
   frame.pack();
   frame.setSize(600,500);
   frame.setResizable(false);
   frame.setLocationRelativeTo(null);
   frame.setVisible(true);
}

public static void main(String[] args){
    View view = new View();
    Game game = new Game();
    view.makeFrame();
    //game.run();

}

Answer 1

Here is the working version. The problem was mainly related to the preferred size of the component. Please note the implementation of method getPreferredSize().

If you would like to see what are the component boundaries I’d recommend using MigLayout layout manager in debug mode (the site has all necessary documentation).

public class CardDisplay extends JComponent {
    private BufferedImage cardImage;

    public CardDisplay() {
        try {
            cardImage = ImageIO.read(new File("Phase10//res//Blue2.png"));
        } catch (final IOException e) {
            e.printStackTrace();
        }    
    }

    @Override
    public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        g.drawImage(cardImage, 0, 0, null);
    }

    @Override
    public Dimension getPreferredSize() {
        if (cardImage == null) {
            return new Dimension(100, 100);
        } else {
            return new Dimension(cardImage.getWidth(null), cardImage.getHeight(null));
        }
    }

    public static class View {
        public View() {}

        public void makeFrame() {
            final JFrame frame = new JFrame("Phase 10");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());
            final JPanel handPanel = new JPanel();
            final CardDisplay cd = new CardDisplay();
            handPanel.setLayout(new FlowLayout());
            frame.add(handPanel, BorderLayout.SOUTH);
            handPanel.add(cd);
            frame.pack();
            frame.setResizable(false);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    }

    public static void main(final String[] args) {
        final View view = new View();
        view.makeFrame();
    }
}