A focus question: button activated by mouse or by ENTE

Question

In the following program:
If the program is run as is ? The button can be activated only by the mouse.
If the part:
// try {
// UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// catch(Exception e) {
// e.printStackTrace();
is used, the button can be activated also by ENTER and the focus is the default.
How to get the second option not using SystemLookAndFeel ?
Which option is better for an application or an applet ?
Help would be appreciated.
import javax.swing.*;
import java.awt.event.*;
public class Focus extends JPanel {
JButton b2;
public Focus() {
// try {
// UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// catch(Exception e) {
// e.printStackTrace();
b2 = new JButton(("Is it ok?"));
add(b2);
b2.addActionListener(buttonListener);
ActionListener buttonListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("Is it ok?")) {
System.out.println("It's ok !!!");
public static void main(String[] args) {
JFrame fr = new JFrame();
     Focus fc = new Focus();
fr.getContentPane().add(fc);
     fr.setVisible(true);
fr.pack();

Answer 1

dialog.setModal(true);beat you!
You did provide code though :)