Question

I want to add a JButton to a JPanel after a click on a button so here is my code :

   JButton testButton = null;

   private void sendmessageButtonActionPerformed(java.awt.event.ActionEvent evt) {
       testButton = new JButton();       
       totalPane.add(testButton,BorderLayout.CENTER);
       totalPane.revalidate();
       totalPane.repaint();
    }

I am using the Netbean GUI builder. When I click, nothing happens. Could anyone help me?

Answer 1

your code is correct for standard Swing JComponents,

1) is totalPane initialized

2) is totalPane added to the Container

3) is totalPane visible in the Container

4) is there BorderLayout defined for totalPane, othervise is there FlowLayout by default

you can simply to test it by add Borders (totalPane.setBorder(BorderFactory.createLineBorder(Color.red));) to the totalPane