Swing II - Absolute Java - page 1035

Display 18.8 A Text Area with Scroll Bars (part 2 of 3)

12 public class ScrollBarDemo extends JFrame
13 implements ActionListener

14 {
15 public static final int WIDTH = 600;

16 public static final int HEIGHT = 400;

17 public static final int LINES = 15;

18 public static final int CHAR_PER_LINE = 30;

19 private JTextArea memoDisplay;

20 private String memo1;

21 private String memo2;

22 public static void main(String[] args)
23 {
24 ScrollBarDemo gui = new ScrollBarDemo();
25 gui.setVisible( true );
26 }

27 public ScrollBarDemo()
28 {
29 super ("Scroll Bars Demo");
30 setSize(WIDTH, HEIGHT);
31 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
32 JPanel buttonPanel = new JPanel();
33 buttonPanel.setBackground(Color.LIGHT_GRAY);
34 buttonPanel.setLayout( new FlowLayout());
35 JButton memo1Button = new JButton("Save Memo 1");
36 memo1Button.addActionListener( this );
37 buttonPanel.add(memo1Button);

38 JButton memo2Button = new JButton("Save Memo 2");
39 memo2Button.addActionListener( this );
40 buttonPanel.add(memo2Button);

41 JButton clearButton = new JButton("Clear");
42 clearButton.addActionListener( this );
43 buttonPanel.add(clearButton);

44 JButton get1Button = new JButton("Get Memo 1");
45 get1Button.addActionListener( this );
46 buttonPanel.add(get1Button);

47 JButton get2Button = new JButton("Get Memo 2");
48 get2Button.addActionListener( this );
49 buttonPanel.add(get2Button);

50 add(buttonPanel, BorderLayout.SOUTH);

51 JPanel textPanel = new JPanel();
52 textPanel.setBackground(Color.BLUE);

(continued)