Question

I am trying the following piece of code in java, but it doesn’t seem to work for some strange kind of fashion:

JFrame myFrame = new JFrame("Test Frame");
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JFrame.setLayout(new GridLayout());

JPanel myPanel = new JPanel();
myPanel.setLayout(new BorderLayout());
myFrame.add(myPanel);

JButton firstButton = new JButton();
myPanel.add(firstButton);

JButton secondButton = new JButton();
myPanel.remove(firstButton);
myPanel.add(secondButton);
myFrame.repaint();

What am I doing wrong?

Answer 1

don’t repaint for JFrame (myFrame.repaint();), you have to (re)validate and repaint the nearest container as JPanel is in your case

JButton secondButton = new JButton();
myPanel.remove(firstButton);
myPanel.add(secondButton);
myPanel.revalidate();
myPanel.repaint();