Object-Oriented Design - Java Concepts - page 786

127 private JTextArea display;
128
129 private ATM theATM;
130
131 private static final int FRAME_WIDTH = 300 ;
132 private static final int FRAME_HEIGHT =
300 ;
133 }

This class uses layout managers to arrange the text field and the keypad buttons.
See Chapter 18 for more information about layout managers.

ch12/atm/KeyPad.java

1 import java.awt.BorderLayout;
2 import java.awt.GridLayout;
3 import java.awt.event.ActionEvent;
4 import java.awt.event.ActionListener;
5 import javax.swing.JButton;
6 import javax.swing.JPanel;
7 import javax.swing.JTextField;
8 9 /**
10 A component that lets the user enter a number, using
11 a keypad labeled with digits.
12 */
13 public class KeyPad extends JPanel
14 {
15 /**
16 Constructs the keypad panel.
17 */
18 public KeyPad()
19 {
20 setLayout( new BorderLayout());
21
22 // Add display field
23
24 display = new JTextField();
25 add(display, ÐNorthÑ );
26
27 // Make button panel

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