Inheritance - Java Concepts - page 664

ch10/textarea/InvestmentFrame.java

1 import java.awt.event.ActionEvent;
2 import java.awt.event.ActionListener;
3 import javax.swing.JButton;
4 import javax.swing.JFrame;
5 import javax.swing.JLabel;
6 import javax.swing.JPanel;
7 import javax.swing.JScrollPane;
8 import javax.swing.JTextArea;
9 import javax.swing.JTextField;
10
11 /**
12 A frame that shows the growth of an investment with variable
interest.
13 */
14 public class InvestmentFrame extends JFrame
15 {
16 public InvestmentFrame()
17 {
18 account = new
BankAccount(INITIAL_BALANCE);
19 resultArea = new JTextArea(AREA_ROWS,
AREA_COLUMNS);
20 resultArea.setEditable(false);
21
22 // Use helper methods
23 createTextField();
24 createButton();
25 createPanel();
26
27 setSize(FRAME_WIDTH, FRAME_HEIGHT);
28 }
29
30 private void createTextField()
31 {
32 rateLabel = new JLabel(ÐInterest Rate:
Ñ);
33
34 final int FIELD_WIDTH = 10 ;
35 rateField = new JTextField(FIELD_WIDTH);
36 rateField.setText( ÐÑ + DEFAULT_RATE);
37 }

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