Swing I - Absolute Java - page 982

Display 17.14 A GUI with a Menu (part 1 of 3)

1 import javax.swing.JFrame;
2 import javax.swing.JPanel;
3 import java.awt.GridLayout;
4 Import java.awt.Color;
5 import javax.swing.JMenu;
6 import javax.swing.JMenuItem;
7 import javax.swing.JMenuBar;
8 import java.awt.event.ActionListener;
9 import java.awt.event.ActionEvent;

10 public class MenuDemo extends JFrame implements ActionListener
11 {
12 public static final int WIDTH = 300;

13 public static final int HEIGHT = 200;

14 private JPanel bluePanel;

15 private JPanel whitePanel;

16 private JPanel grayPanel;

17 public static void main(String[] args)
18 {
19 MenuDemo gui = new MenuDemo();
20 gui.setVisible( true );
21 }

22 public MenuDemo()
23 {
24 super ("Menu Demonstration");
25 setSize(WIDTH, HEIGHT);
26 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
27 setLayout( new GridLayout(1, 3));

28 bluePanel = new JPanel();
29 bluePanel.setBackground(Color.LIGHT_GRAY);
30 add(bluePanel);

31 whitePanel = new JPanel();
32 whitePanel.setBackground(Color.LIGHT_GRAY);
33 add(whitePanel);
34 grayPanel = new JPanel();