JAVA大学简明教程：实例程序设计_CD代码.rar_JAVA大学简明教程：实例程序设计_cd_code_代码

// Tutorial 26: ATM.java // ATM application allows users to access an account, // view the balance and withdraw money from the account. import java.awt.*; import java.awt.event.*; import java.sql.*; import java.text.*; import javax.swing.*; import javax.swing.event.*; public class ATM extends JFrame { // JTextArea to display message private JTextArea messageJTextArea; // JTextField to enter PIN or withdrawal amount private JTextField numberJTextField; // JPanel for number JButtons private JPanel buttonsJPanel; // JButtons for input of PIN or withdrawal amount private JButton oneJButton; private JButton twoJButton; private JButton threeJButton; private JButton fourJButton; private JButton fiveJButton; private JButton sixJButton; private JButton sevenJButton; private JButton eightJButton; private JButton nineJButton; private JButton zeroJButton; // JButton to submit PIN or withdrawal amount private JButton enterJButton; // JButton to view balance private JButton balanceJButton; // JButton to withdraw from account private JButton withdrawJButton; // JButton to close the transaction private JButton doneJButton; // JPanel to get account numbers private JPanel accountNumberJPanel; // JLabel and JComboBox for account numbers private JLabel accountNumberJLabel; private JComboBox accountNumberJComboBox; // constants for user action private final static int ENTER_PIN = 1; private final static int WITHDRAWAL = 2; // instance variables used to store PIN and // firstName from database private String pin, firstName; // instance variable used to distinguish user action private int action; // instance variables used to store user selected account number // and PIN private String userAccountNumber, userPIN; // instance variable used to store account balance private double balance; // instance variables used to manipulate database private Connection myConnection; private Statement myStatement; private ResultSet myResultSet; // constructor public ATM( String databaseDriver, String databaseURL ) { // establish connection to database try { // load Cloudscape driver Class.forName( databaseDriver ); // connect to database myConnection = DriverManager.getConnection( databaseURL ); // create Statement for executing SQL myStatement = myConnection.createStatement(); } catch ( SQLException exception ) { exception.printStackTrace(); } catch ( ClassNotFoundException exception ) { exception.printStackTrace(); } createUserInterface(); // set up GUI } // end constructor // create and position GUI components; register event handler private void createUserInterface() { // get content pane for attaching GUI components Container contentPane = getContentPane(); // enable explicit positioning of GUI components contentPane.setLayout( null ); // set up messageJTextArea messageJTextArea = new JTextArea(); messageJTextArea.setBounds( 40, 16, 288, 88 ); messageJTextArea.setText( "Please select your account number." ); messageJTextArea.setBorder( BorderFactory.createLoweredBevelBorder() ); messageJTextArea.setEditable( false ); contentPane.add( messageJTextArea ); // set up numberJTextField numberJTextField = new JTextField(); numberJTextField.setBounds( 110, 120, 128, 21 ); numberJTextField.setBorder( BorderFactory.createLoweredBevelBorder() ); numberJTextField.setEditable( false ); contentPane.add( numberJTextField ); // set up buttonsJPanel buttonsJPanel = new JPanel(); buttonsJPanel.setBounds( 44, 160, 276, 150 ); buttonsJPanel.setBorder( BorderFactory.createEtchedBorder() ); buttonsJPanel.setLayout( null ); contentPane.add( buttonsJPanel ); // set up oneJButton oneJButton = new JButton(); oneJButton.setBounds( 53, 28, 24, 24 ); oneJButton.setText( "1" ); oneJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( oneJButton ); oneJButton.addActionListener( new ActionListener() // anonymous inner class { // event handler called when oneJButton is clicked public void actionPerformed( ActionEvent event ) { oneJButtonActionPerformed( event ); } } // end anonymous inner class ); // end call to addActionListener // set up twoJButton twoJButton = new JButton(); twoJButton.setBounds( 77, 28, 24, 24 ); twoJButton.setText( "2" ); twoJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( twoJButton ); twoJButton.addActionListener( new ActionListener() // anonymous inner class { // event handler called when twoJButton is clicked public void actionPerformed( ActionEvent event ) { twoJButtonActionPerformed( event ); } } // end anonymous inner class ); // end call to addActionListener // set up threeJButton threeJButton = new JButton(); threeJButton.setBounds( 101, 28, 24, 24 ); threeJButton.setText( "3" ); threeJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( threeJButton ); threeJButton.addActionListener( new ActionListener() // anonymous inner class { // event handler called when threeJButton is clicked public void actionPerformed( ActionEvent event ) { threeJButtonActionPerformed( event ); } } // end anonymous inner class ); // end call to addActionListener // set up fourJButton fourJButton = new JButton(); fourJButton.setBounds( 53, 52, 24, 24 ); fourJButton.setText( "4" ); fourJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( fourJButton ); fourJButton.addActionListener( new ActionListener() // anonymous inner class { // event handler called when fourJButton is clicked public void actionPerformed( ActionEvent event ) { fourJButtonActionPerformed( event ); } } // end anonymous inner class ); // end call to addActionListener // set up fiveJButton fiveJButton = new JButton(); fiveJButton.setBounds( 77, 52, 24, 24 ); fiveJButton.setText( "5" ); fiveJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( fiveJButton ); fiveJButton.addActionListener( new ActionListener() // anonymous inner class { // event handler called when fiveJButton is clicked public void actionPerformed( ActionEvent event ) { fiveJButtonActionPerformed( event ); } } // end anonymous inner class ); // end call to addActionListener // set up sixJButton sixJButton = new JButton(); sixJButton.setBounds( 101, 52, 24, 24 ); sixJButton.setText( "6" ); sixJButton.setBorder( BorderFactory.createRaisedBevelBorder() ); buttonsJPanel.add( sixJButton ); sixJButton.addActionListener( new ActionListener() // anonymous inner class