Animation - Java 7 for Absolute Beginners - page 182

public class ScootBall implements ActionListener {
private static final long serialVersionUID = 1L;
ScootBallPanel scootBallPanel = new ScootBallPanel();
JFrame frame = new JFrame("ScootBall");
JPanel buttonPanel=new JPanel(new FlowLayout(FlowLayout.CENTER));
JButton scootButton=new JButton("Scoot");
Thread animationThread = null;
private void addMenu(JFrame frame) {
JMenu file = new JMenu("File");
file.setMnemonic('F');
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.setMnemonic('x');
exitItem.addActionListener(this);
file.add(exitItem);
JMenuBar menuBar = new JMenuBar();
menuBar.add(file);
frame.setJMenuBar(menuBar);
}
private void createAndShowGUI() {
addMenu(frame);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new BorderLayout());
scootButton.addActionListener(this);
buttonPanel.add(scootButton);
scootBallPanel.setPreferredSize(new Dimension(400, 200));
scootBallPanel.setBackground(Color.WHITE);
frame.getContentPane().add(scootBallPanel,BorderLayout.CENTER);
frame.getContentPane().add(scootBallPanel);
frame.getContentPane().add(buttonPanel,BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
ScootBall scootBall = new ScootBall();
scootBall.createAndShowGUI();
}
// The actionPerformed method listens for actions taken by the user
public void actionPerformed(ActionEvent e) {
// If the user chooses Exit, then exit
if (e.getActionCommand().equals("Exit")) {
System.exit(0);
}
// Since we didn't exit, check for whether the user clicked the Scoot button
// and ignore the click if a ball is already moving. If not, start one moving.
if (e.getActionCommand().equals("Scoot") && scootBallPanel.isAnimating() == false) {
scootBallPanel.reset();