Java Utililty Methods JButton Default

void applyDefaultProperties(final JButton comp)
Sets default background and foreground color as well as a default font for the specified component.

if (comp == null) {
 return;
applyProperties(comp, "Button.background", 
 "Button.foreground", 
 "Button.font"); 

void ensureDefaultButtonWidth(JButton button)
Ensures a button has a specific minimum width, similar to what Windows does.

ensureButtonWidth(button, DEFAULT_BUTTON_SIZE);

void setDefaultButton(final JRootPane rp, final JButton b)
set Default Button

rp.setDefaultButton(b);

void setDefaultButton(JButton jButton)
set Default Button

if (jButton == null) {
 throw new IllegalArgumentException();
jButton.getRootPane().setDefaultButton(jButton);

void setupWindowContentPane(final Window aWindow, final Component aCenterComponent, final Component aButtonPane, final JButton defaultButton)
Sets up the given window content pane by setting its border to provide a good default spacer, and setting the content pane to the given components.

final JPanel contentPane = new JPanel(new BorderLayout());
contentPane.setBorder(BorderFactory.createEmptyBorder(DIALOG_PADDING, DIALOG_PADDING, 
 DIALOG_PADDING, DIALOG_PADDING));
contentPane.add(aCenterComponent, BorderLayout.CENTER);
contentPane.add(aButtonPane, BorderLayout.PAGE_END);
if (aWindow instanceof JDialog) {
 ((JDialog) aWindow).setContentPane(contentPane);
 ((JDialog) aWindow).getRootPane().setDefaultButton(defaultButton);
...