private JPanel jpDel = new JPanel();

private JLabel lbNo, lbName, lbDate, lbBal;

private JTextField txtNo, txtName, txtDate, txtBal;

private JButton btnDel, btnCancel;

private int recCount = 0;

private int rows = 0;

private int total = 0;

//String Type Array use to Load Records From File.

private String records[][] = new String [500][6];

private FileInputStream fis;

private DataInputStream dis;

DeleteCustomer () {

// super(Title, Resizable, Closable, Maximizable, Iconifiable)

super ("Delete Account Holder", false, true, false, true);

setSize (350, 235);

jpDel.setLayout (null);

lbNo = new JLabel ("Account No:");

lbNo.setForeground (Color.black);

lbNo.setBounds (15, 20, 80, 25);

lbName = new JLabel ("Person Name:");

lbName.setForeground (Color.black);

lbName.setBounds (15, 55, 90, 25);

lbDate = new JLabel ("Last Transaction:");

lbDate.setForeground (Color.black);

lbDate.setBounds (15, 90, 100, 25);

lbBal = new JLabel ("Balance:");

lbBal.setForeground (Color.black);

lbBal.setBounds (15, 125, 80, 25);

txtNo = new JTextField ();

txtNo.setHorizontalAlignment (JTextField.RIGHT);

txtNo.setBounds (125, 20, 200, 25);

txtName = new JTextField ();

txtName.setEnabled (false);

txtName.setBounds (125, 55, 200, 25);

txtDate = new JTextField ();

txtDate.setEnabled (false);

txtDate.setBounds (125, 90, 200, 25);

txtBal = new JTextField ();

txtBal.setEnabled (false);

txtBal.setHorizontalAlignment (JTextField.RIGHT);

txtBal.setBounds (125, 125, 200, 25);

//Aligning The Buttons.

btnDel = new JButton ("Delete");

btnDel.setBounds (20, 165, 120, 25);

btnDel.addActionListener (this);

btnCancel = new JButton ("Cancel");

btnCancel.setBounds (200, 165, 120, 25);

btnCancel.addActionListener (this);

//Adding the All the Controls to Panel.

jpDel.add (lbNo);

jpDel.add (txtNo);

jpDel.add (lbName);

jpDel.add (txtName);

jpDel.add (lbDate);

jpDel.add (txtDate);

jpDel.add (lbBal);

jpDel.add (txtBal);

jpDel.add (btnDel);

jpDel.add (btnCancel);

//Restricting The User Input to only Numerics in Numeric TextBoxes.

txtNo.addKeyListener (new KeyAdapter() {

public void keyTyped (KeyEvent ke) {

char c = ke.getKeyChar ();

if (!((Character.isDigit (c) || (c == KeyEvent.VK_BACK_SPACE)))) {

getToolkit().beep ();

ke.consume ();

}

}

}

);

//Checking the Accunt No. Provided By User on Lost Focus of the TextBox.

txtNo.addFocusListener (new FocusListener () {

public void focusGained (FocusEvent e) { }

public void focusLost (FocusEvent fe) {

if (txtNo.getText().equals ("")) { }

else {

rows = 0;

populateArray (); //Load All Existing Records in Memory.

findRec (); //Finding if Account No. Already Exist or Not.

}

}

}

);

//Adding Panel to Window.

getContentPane().add (jpDel);

populateArray (); //Load All Existing Records in Memory.

//In the End Showing the New Account Window.

setVisible (true);

}

//Function use By Buttons of Window to Perform Action as User Click Them.

public void actionPerformed (ActionEvent ae) {

Object obj = ae.getSource();

if (obj == btnDel) {

if (txtNo.getText().equals("")) {

JOptionPane.showMessageDialog (this, "Please! Provide Id of Customer.",

"BankSystem - EmptyField", JOptionPane.PLAIN_MESSAGE);

txtNo.requestFocus();

}

else {

deletion (); //Confirm Deletion of Current Record.

}

}

if (obj == btnCancel) {

txtClear ();

setVisible (false);

dispose();

}

}

//Function use to load all Records from File when Application Execute.

void populateArray () {

try {

fis = new FileInputStream ("Bank.dat");

dis = new DataInputStream (fis);

//Loop to Populate the Array.

while (true) {

for (int i = 0; i < 6; i++) {

records[rows][i] = dis.readUTF ();

}

rows++;

}

}

catch (Exception ex) {

total = rows;

if (total == 0) {

JOptionPane.showMessageDialog (null, "Records File is Empty.\nEnter Records First to Display.",

"BankSystem - EmptyFile", JOptionPane.PLAIN_MESSAGE);

btnEnable ();

}

else {

try {

dis.close();

fis.close();

}

catch (Exception exp) { }

}

}

}

//Function use to Find Record by Matching the Contents of Records Array with ID TextBox.

void findRec () {

boolean found = false;

for (int x = 0; x < total; x++) {

if (records[x][0].equals (txtNo.getText())) {

found = true;

showRec (x);

break;

}

}

if (found == false) {

String str = txtNo.getText ();

txtClear ();

JOptionPane.showMessageDialog (this, "Account No. " + str + " doesn't Exist.",

"BankSystem - WrongNo", JOptionPane.PLAIN_MESSAGE);

}

}

//Function which display Record from Array onto the Form.

void showRec (int intRec) {

txtNo.setText (records[intRec][0]);

txtName.setText (records[intRec][1]);

txtDate.setText (records[intRec][2] + ", " + records[intRec][3] + ", " + records[intRec][4]);

txtBal.setText (records[intRec][5]);

recCount = intRec;

}

//Confirming the Deletion Decision made By User of Program.

void deletion () {

try {

//Show a Confirmation Dialog.

int reply = JOptionPane.showConfirmDialog (this,

"Are you Sure you want to Delete\n" + txtName.getText () + " Record From BankSystem?",

"Bank System - Delete", JOptionPane.YES_NO_OPTION, JOptionPane.PLAIN_MESSAGE);

//Check the User Selection.

if (reply == JOptionPane.YES_OPTION) {

delRec (); //Delete the Selected Contents of Array.

}

else if (reply == JOptionPane.NO_OPTION) { }

}

catch (Exception e) {}

}

//Function use to Delete an Element from the Array.

void delRec () {

try {

if (records != null) {

for(int i = recCount; i < total; i++) {

for (int r = 0; r < 6; r++) {

records[i][r] = records[i+1][r];

if (records[i][r] == null) break;

}

}

total = total - 1;

deleteFile ();

}

}

catch (ArrayIndexOutOfBoundsException ex) { }

}

//Function use to Save Records to File After Deleting the Record of User Choice.

void deleteFile () {

try {

FileOutputStream fos = new FileOutputStream ("Bank.dat");

DataOutputStream dos = new DataOutputStream (fos);

if (records != null) {

for (int i = 0; i < total; i++) {

for (int r = 0; r < 6; r++) {

dos.writeUTF (records[i][r]);

if (records[i][r] == null) break;

}

}

JOptionPane.showMessageDialog (this, "Record has been Deleted Successfuly.",

"BankSystem - Record Deleted", JOptionPane.PLAIN_MESSAGE);

txtClear ();

}

else { }

dos.close();

fos.close();

}

catch (IOException ioe) {

JOptionPane.showMessageDialog (this, "There are Some Problem with File",

"BankSystem - Problem", JOptionPane.PLAIN_MESSAGE);

}

}

//Function use to Clear all TextFields of Window.

void txtClear () {

txtNo.setText ("");

txtName.setText ("");

txtDate.setText ("");

txtBal.setText ("");

txtNo.requestFocus ();

}

//Function use to Lock Controls of Window.

void btnEnable () {

txtNo.setEnabled (false);

btnDel.setEnabled (false);

}