Java tutorial
import java.awt.Dimension; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JPanel; public class DefaultButton extends JPanel { public DefaultButton() { } public static void main(String[] a) { JDialog f = new JDialog(); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); JButton btOK = new JButton("Press Enter to click me, I am the default."); btOK.setToolTipText("Save and exit"); f.getRootPane().setDefaultButton(btOK); JPanel p = new JPanel(); p.add(btOK); p.add(new JButton("I am NOT the default.")); f.getContentPane().add(p); f.pack(); f.setSize(new Dimension(300, 200)); f.show(); } }