How can i add new jcomponent to a frame?

Question

hi.
how can we add new component to a frame? look at this code. Why when i click on button, nothing added to frame? event handled correctly and frame size changes but no button adds to frame.
private void convertButtonMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
JButton newButton = new JButton("new");
getContentPane().add(newButton , BorderLayout.CENTER);
newButton.setVisible(true);
setSize(500, 500);
}

Answer 1

Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.
Well typically you wouldn't add a button to the Center of a BorderLayout. If you really want to do this you should be using a [Card Layout|http://java.sun.com/docs/books/tutorial/uiswing/TOC.html].
In general the code for adding/removing components should be:
panel.add(...)
panel.revalidate();
panel.repaint();