(Bank Account Information Debugging Exercise) Copy the C:\Examples\ Tutorial04\Exercises\DebuggingExercise directory to the C:\SimplyJava directory. Compile and run the Bank Account Information application. Remove any syntax errors and logic errors, so that the application runs correctly. [Hint: All the syntax and logic errors appear in the event handler code (lines 146–156 of the application).]

Question

What will be an ideal response?

Answer 1

The method name Integer.parseInt was spelled with incorrect capitalization on lines 150–151. Also, the multiplication operator in line 150 should be an addition operator.
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1 // Exercise 4.16: AccountInformation.java
2 // This application inputs and outputs account information.
3 import java.awt.*;
4 import java.awt.event.*;
5 import javax.swing.*;
6 import javax.swing.border.*;
7
8 public class AccountInformation extends JFrame
9 {
10 // JPanel to group deposit components
11 private JPanel enterJPanel;
12
13 // JLabel and JTextField for deposits
14 private JLabel depositJLabel;
15 private JTextField depositJTextField;
16
17 // JButton to initiate balance calculation
18 private JButton enterJButton;
19
20 // JPanel to group account information components
21 private JPanel accountJPanel;
22
23 // JLabel and JTextField for account holder's name
24 private JLabel nameJLabel;
25 private JTextField nameJTextField;
26
27 // JLabel and JTextField for account number
28 private JLabel accountNumberJLabel;
29 private JTextField accountNumberJTextField;
30
31 // JLabel and JTextField for balance
32 private JLabel balanceJLabel;
33 private JTextField balanceJTextField;
34
35 // no-argument constructor
36 public AccountInformation()
37 {
38 createUserInterface();
39 }
40
41 // create and position GUI components; register event handlers
42 private void createUserInterface()
43 {
44 // get content pane and set layout to null
45 Container contentPane = getContentPane();
46 contentPane.setLayout( null );
47
48 // set up enterJPanel
49 enterJPanel = new JPanel();
50 enterJPanel.setLayout( null );
51 enterJPanel.setBounds( 16, 16, 152, 126 );
52 enterJPanel.setBorder(
53 new TitledBorder( "Enter information" ) );
54 contentPane.add( enterJPanel );
55
56 // set up depositJLabel
57 depositJLabel = new JLabel();
58 depositJLabel.setText( "Deposit amount:" );
59 depositJLabel.setBounds( 16, 40, 140, 16 );
60 enterJPanel.add( depositJLabel );
61
62 // set up depositJTextField
63 depositJTextField = new JTextField();
64 depositJTextField.setText( "0" );
65 depositJTextField.setBounds( 16, 56, 120, 21 );
66 depositJTextField.setHorizontalAlignment( JTextField.RIGHT );
67 enterJPanel.add( depositJTextField );
68
69 // set up enterJButton
70 enterJButton = new JButton();
71 enterJButton.setText( "Enter" );
72 enterJButton.setBounds( 16, 150, 152, 34 );
73 contentPane.add( enterJButton );
74 enterJButton.addActionListener(
75
76 new ActionListener() // anonymous inner class
77 {
78 // event handler called when enterJButton is pressed
79 public void actionPerformed( ActionEvent event )
80 {
81 enterJButtonActionPerformed( event );
82 }
83
84 } // end anonymous inner class
85
86 ); // end call to addActionListener
87
88 // set up accountJPanel
89 accountJPanel = new JPanel();
90 accountJPanel.setLayout( null );
91 accountJPanel.setBounds( 180, 16, 136, 170 );
92 accountJPanel.setBorder(
93 new TitledBorder( "Account information" ) );
94 contentPane.add( accountJPanel );
95
96 // set up nameJLabel
97 nameJLabel = new JLabel();
98 nameJLabel.setText( "Name:" );
99 nameJLabel.setBounds( 16, 24, 100, 16 );
100 accountJPanel.add( nameJLabel );
101
102 // set up nameJTextField
103 nameJTextField = new JTextField();
104 nameJTextField.setText( "Sue Purple" );
105 nameJTextField.setBounds( 16, 40, 104, 21 );
106 nameJTextField.setEditable( false );
107 accountJPanel.add( nameJTextField );
108
109 // set up accountNumberJLabel
110 accountNumberJLabel = new JLabel();
111 accountNumberJLabel.setText( "Account Number:" );
112 accountNumberJLabel.setBounds( 16, 70, 140, 16 );
113 accountJPanel.add( accountNumberJLabel );
114
115 // set up accountNumberJTextField
116 accountNumberJTextField = new JTextField();
117 accountNumberJTextField.setText( "12345" );
118 accountNumberJTextField.setBounds( 16, 86, 104, 21 );
119 accountNumberJTextField.setEditable( false );
120 accountNumberJTextField.setHorizontalAlignment(
121 JTextField.RIGHT );
122 accountJPanel.add( accountNumberJTextField );
123
124 // set up balanceJLabel
125 balanceJLabel = new JLabel();
126 balanceJLabel.setText( "Balance:" );
127 balanceJLabel.setBounds( 16, 116, 100, 16 );
128 accountJPanel.add( balanceJLabel );
129
130 // set up balanceJTextField
131 balanceJTextField = new JTextField();
132 balanceJTextField.setText( "0" );
133 balanceJTextField.setBounds( 16, 132, 104, 21 );
134 balanceJTextField.setEditable( false );
135 balanceJTextField.setHorizontalAlignment( JTextField.RIGHT );
136 accountJPanel.add( balanceJTextField );
137
138 // set properties of application’s window
139 setTitle( "Account Information" ); // set title bar text
140 setSize( 340, 225 ); // set window's size
141 setVisible( true ); // display window
142
143 } // end method createUserInterface
144
145 // update account balance based on user input
146 private void enterJButtonActionPerformed( ActionEvent event )
147 {
148 // display new balance
149 balanceJTextField.setText( String.valueOf(
150 Integer.parseInt( balanceJTextField.getText() ) +
151 Integer.parseInt( depositJTextField.getText() ) ) );
152
153 // clear depositJTextField
154 depositJTextField.setText( "0" );
155
156 } // end method enterJButtonActionPerformed
157
158 // main method
159 public static void main( String args[] )
160 {
161 AccountInformation application = new AccountInformation();
162 application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
163
164 } // end method main
165
166 } // end class AccountInformation
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