Swing II - Java - page 1018

Answers to Self-Test Exercises
1. All the methods in Display 18.1. If there is no particular action that you want
the method to perform, you can give the method an empty body.
2. The smaller window goes away but the larger window stays. This is the default action
for the close-window button and we did not change it for the smaller window.
3. dispose
4. The import statements are the same as in Display 18.2. The rest of the definition fol-

lows. This definition is in the file WindowListenerDemo3 on the accompanying CD.

extra code
on CD

public class WindowListenerDemo3 extends JFrame
implements WindowListener
{
public static final int WIDTH = 300; //for main window
public static final int HEIGHT = 200; //for main window
public static final int SMALL_WIDTH = 200; //for confirm window
public static final int SMALL_HEIGHT = 100; //for confirm window

private class ConfirmWindow extends JFrame
implements ActionListener
{
public ConfirmWindow()
{
setSize(SMALL_WIDTH, SMALL_HEIGHT);
getContentPane().setBackground(Color.YELLOW);
setLayout( new BorderLayout());

JLabel confirmLabel = new JLabel(
"Are you sure you want to exit?");
add(confirmLabel, BorderLayout.CENTER);

JPanel buttonPanel = new JPanel();
buttonPanel.setBackground(Color.ORANGE);
buttonPanel.setLayout( new FlowLayout());

JButton exitButton = new JButton("Yes");
exitButton.addActionListener( this );
buttonPanel.add(exitButton);

JButton cancelButton = new JButton("No");
cancelButton.addActionListener( this );
buttonPanel.add(cancelButton);

add(buttonPanel, BorderLayout.SOUTH);
}

public void actionPerformed(ActionEvent e)
{