java swing dynamically adding components [duplicate]

Answer 1

You need to call revalidate after adding (or removing) components:

rightPanel.add(label);
rightPanel.revalidate();

should do the trick.

Answer 2

call

rightPanel.revalidate();
rightPanel.repaint();

after adding

Answer 3

just add this line after you add the label

rightPanel.updateUI();

when you add any component at runtime you need to update the ui using this method