CODEWITHSUNDEEP
javaswing
wanderer0810
wanderer0810

Reputation: 420

JPanel not showing up on JFrame if added as a class

I am trying to add a JButton to a JPanel that I create as a class, like so:

public class Popup extends Main {

    public Popup() {
        JPanel popup = new JPanel();
        JButton button = new JButton("SUPER COOL BUTTON");
        popup.add(button);
        popup.setPreferredSize(new Dimension(50,50));
    }
}

Main.java:

private void createFrame() {

    JFrame frame = new JFrame("TEAM PROJECT");

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.add(new Popup(), BorderLayout.CENTER);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}

When I do this, the frame creates but has nothing in it. Similar code works when trying to draw on the panel using paintComponent, so is the problem that you can't add SwingComponents this way?

What can I do to get the JPanel created in Popup to be added to the frame created in Main?

Upvotes: 0

Views: 38

Answers (1)

camickr
camickr

Reputation: 324207

Why would you extend Main (as that appears to be the class where you create the JFrame)?

If you want to add a button to a panel then extend JPanel and add your button to your class (which is a JPanel already so there is no need to create another JPanel):

public class Popup extends JPanel {

    public Popup() {
        //JPanel popup = new JPanel();
        JButton button = new JButton("SUPER COOL BUTTON");
        add( button );
        //popup.add(button);
        //popup.setPreferredSize(new Dimension(50,50));
    }
}

Upvotes: 2

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