Cannot get text file to print in jtable. Using text file as a database

Question

Instead of doing JDBC i am using text file as database. I cant get data from text file to print into JTable when i click find button. Goal is to find a record and print that record only, but for now i am trying to print all the records. Once i get that i will change my code to search desired record and print it. when i click the find button nothing happens. Can you please take a look at my code, dbTest() method. thanks.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
import java.io.*;
public class GUIdirectory extends JFrame
implements ActionListener {
// Define the components and the layout
JLabel inputLabel_lastname = new JLabel("Last Name");
JTextField inputText_lastname = new JTextField("Last Name",15);
JLabel inputLabel_firstname = new JLabel("First Name");
JTextField inputText_firstname = new JTextField(" ",15);
JLabel inputLabel_middleinitial = new JLabel("Middle Initial");
JTextField inputText_middleinitial = new JTextField(" ",4);
JButton inputButton = new JButton("Find");
JPanel inputLayout = new JPanel(new FlowLayout(FlowLayout.CENTER,5,5));
JButton jButton1 = new JButton();
//create a new table and scrollpane
JTable dataTable = new JTable();
JScrollPane dataTableScrollPane = new JScrollPane();
public static void main(String args[]) {
GUIdirectory gui = new GUIdirectory("Telephone Directory");
gui.show();
gui.pack();
//TokenTest tt = new TokenTest();
//gui.dbTest();
public GUIdirectory(String Title) {
super(Title);
// Add ourselves as a listener for the window closing
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
exitWindow(1); }
inputLabel_lastname.setLabelFor(inputText_lastname);
inputText_lastname.setHorizontalAlignment(JTextField.RIGHT);
inputText_lastname.addActionListener(this);
inputLabel_firstname.setLabelFor(inputText_firstname);
inputText_firstname.setHorizontalAlignment(JTextField.RIGHT);
inputText_firstname.addActionListener(this);
inputLabel_middleinitial.setLabelFor(inputText_middleinitial);
inputText_middleinitial.setHorizontalAlignment(JTextField.RIGHT);
inputText_middleinitial.addActionListener(this);
inputButton.addActionListener(this);
inputLayout.add(inputLabel_lastname);
inputLayout.add(inputText_lastname);
inputLayout.add(inputLabel_firstname);
inputLayout.add(inputText_firstname);
inputLayout.add(inputLabel_middleinitial);
inputLayout.add(inputText_middleinitial);
inputLayout.add(inputButton);
getContentPane().setLayout(new BorderLayout(5,5));
getContentPane().add("North",inputLayout);
dataTableScrollPane.setViewportView(dataTable);
getContentPane().add("Center",dataTableScrollPane);
// A default method, primarily used for testing.
public void actionPerformed(ActionEvent evt) {
GUIdirectory gui = new GUIdirectory();
gui.dbTest();
void dbTest() {
DataInputStream dis = null;
String dbRecord = null;
String hold;
try {
File f = new File("customer.txt");
FileInputStream fis = new FileInputStream(f);
BufferedInputStream bis = new BufferedInputStream(fis);
dis = new DataInputStream(bis);
Vector dataVector = new Vector();
Vector headVector = new Vector(2);
Vector row = new Vector();
// read the record of the text database
while ( (dbRecord = dis.readLine()) != null) {
StringTokenizer st = new StringTokenizer(dbRecord, ",");
while (st.hasMoreTokens()) {
row.addElement(st.nextToken());
System.out.println("Inside nested loop: " + row);
System.out.println("inside loop: " + row);
dataVector.addElement(row);
System.out.println("outside loop: " + row);
headVector.addElement("Title");
headVector.addElement("Type");
dataTable = new JTable(dataVector, headVector);
dataTableScrollPane.setViewportView(dataTable);
} catch (IOException e) {
// catch io errors from FileInputStream or readLine()
System.out.println("Uh oh, got an IOException error!" + e.getMessage());
} finally {
// if the file opened okay, make sure we close it
if (dis != null) {
try {
dis.close();
} catch (IOException ioe) {
} // end if
} // end finally
} // end dbTest
// Exits the program upon closing the window
public void exitWindow(int i) {
System.exit(i);
public GUIdirectory() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
jButton1.setText("jButton1");
this.getContentPane().add(jButton1, BorderLayout.CENTER);

Answer 1

Nothing happens because in the actionPerformed() method you are creating a new version of GUIdirectory. You just want to execute the dbTest() method of the current instance of GUIdirectory.
The code should be:
public void actionPerformed(ActionEvent evt)
//GUIdirectory gui = new GUIdirectory();
//gui.dbTest();
dbTest();