Calculations with Jtextfiled data

Question

HI,
I have Four Jtextfields.The user has to enter the data in the two jtextfields.
in the third field i have to print the sum of the first two fields.
Please help me . This is my code
package samples;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.awt.*;
import java.awt.event.*;
class PiGUI extends JFrame {
JTextField totalRepairs = new JTextField("Enter Number",8);
JTextField successfulFirstRepairs = new JTextField("Enter Number",8);
JTextField repeatRepairs = new JTextField(8);
JTextField fFVRatio = new JTextField(8);
JLabel StaticText = new JLabel("FFV-Take it to the Next Level");
JLabel TotalRepairs = new JLabel("Total Repairs");
JLabel SuccessfulFirstRepairs = new JLabel("Successful First Repairs");
JLabel RepeatRepairs = new JLabel("Repeat Repairs");
JLabel FFVRatio = new JLabel("FFV Ratio");
//Calculator calc = new Calculator(this);
PiGUI() {
// Frame listener - closeing window
addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});
// Configure GUI layout
Container inter = getContentPane();
inter.setLayout(new FlowLayout());
// Set the box is editable or not
totalRepairs.setEditable(true);
successfulFirstRepairs.setEditable(true);
repeatRepairs.setEditable(false);
fFVRatio.setEditable(false);
// Add components to GUI
inter.add(StaticText);
inter.add(TotalRepairs);
inter.add(SuccessfulFirstRepairs);
inter.add(RepeatRepairs);
inter.add(FFVRatio);
inter.add(totalRepairs);
inter.add(successfulFirstRepairs);
inter.add(repeatRepairs);
inter.add(fFVRatio);
StaticText.setBounds(1,25,500,20);
TotalRepairs.setBounds(5,5,150,20);
totalRepairs.setBounds(5,30,150,40);
SuccessfulFirstRepairs.setBounds(5,75,150,20);
successfulFirstRepairs.setBounds(5,100,150,40);
RepeatRepairs.setBounds(5,5,150,20);
repeatRepairs.setBounds(5,30,150,40);
FFVRatio.setBounds(5,75,150,20);
fFVRatio.setBounds(5,100,150,40);
setSize(450,450); // Size of window
//setTitle("PI Calculator"); // Title of window
setVisible(true); // Set visible
setResizable(false); // Disallow resize
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
     int totalRepairs1=Integer.parseInt(totalRepairs.getText());
     int successfulFirstRepairs1 =Integer.parseInt(successfulFirstRepairs.getText());
     int repeatRepairs1 = totalRepairs1-successfulFirstRepairs1;
     double fFVRatio1 = successfulFirstRepairs1/totalRepairs1;
     //repeatRepairs.setText(repeatRepairs1);
totalRepairs.addActionListener(actionListener);
successfulFirstRepairs.addActionListener(actionListener);
KeyListener keyListener = new KeyListener() {
public void keyPressed(KeyEvent e) { }
public void keyReleased(KeyEvent e) { }
public void keyTyped(KeyEvent e) {if ( ! Character.isDigit(e.getKeyChar())) {
                   Toolkit.getDefaultToolkit().beep();
                   e.consume();
totalRepairs.addKeyListener(keyListener);
successfulFirstRepairs.addKeyListener(keyListener);
InputVerifier verifier = new InputVerifier() {
public boolean verify(JComponent input) {
final JTextComponent source = (JTextComponent) input;
String text = source.getText();
if (text.length() == 0) {
Runnable runnable = new Runnable() {
public void run() {
JOptionPane.showMessageDialog(source,
"Can't leave Blank.", "Error Dialog",
JOptionPane.ERROR_MESSAGE);
SwingUtilities.invokeLater(runnable);
return false;
else {
return true;
totalRepairs.setInputVerifier(verifier);
successfulFirstRepairs.setInputVerifier(verifier);
public class BBB {
public static void main(String[] args) {
PiGUI piGUI = new PiGUI();
Thanks in advance

Answer 1

package samples;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.awt.*;
import java.awt.event.*;
class PiGUI extends JFrame {
    JTextField totalRepairs  = new JTextField("Enter Number",8);
    JTextField successfulFirstRepairs  = new JTextField("Enter Number",8);
    JTextField repeatRepairs  = new JTextField(8);
    JTextField fFVRatio  = new JTextField(8);
    JLabel StaticText = new JLabel("FFV-Take it to the Next Level");
    JLabel TotalRepairs = new JLabel("Total Repairs");
    JLabel SuccessfulFirstRepairs  = new JLabel("Successful First Repairs");
    JLabel RepeatRepairs = new JLabel("Repeat Repairs");
    JLabel FFVRatio  = new JLabel("FFV Ratio");
    //Calculator calc = new Calculator(this);
    PiGUI() {
        // Frame listener - closeing window
        addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});
        // Configure GUI layout
        Container inter = getContentPane();
        inter.setLayout(new FlowLayout());
        // Set the box is editable or not
        totalRepairs.setEditable(true);
        successfulFirstRepairs.setEditable(true);
        repeatRepairs.setEditable(false);
        fFVRatio.setEditable(false);
         // Add components to GUI
        inter.add(StaticText);
        inter.add(TotalRepairs);
        inter.add(SuccessfulFirstRepairs);
        inter.add(RepeatRepairs);
        inter.add(FFVRatio);
        inter.add(totalRepairs);
        inter.add(successfulFirstRepairs);
        inter.add(repeatRepairs);
        inter.add(fFVRatio);
        StaticText.setBounds(1,25,500,20);
        TotalRepairs.setBounds(5,5,150,20);
        totalRepairs.setBounds(5,30,150,40);
        SuccessfulFirstRepairs.setBounds(5,75,150,20);
        successfulFirstRepairs.setBounds(5,100,150,40);
        RepeatRepairs.setBounds(5,5,150,20);
        repeatRepairs.setBounds(5,30,150,40);
        FFVRatio.setBounds(5,75,150,20);
        fFVRatio.setBounds(5,100,150,40);
        setSize(450,450); // Size of window
        //setTitle("PI Calculator"); // Title of window
        setVisible(true); // Set visible
        setResizable(false); // Disallow resize
        ActionListener actionListener = new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                 double totalRepairs1=Integer.parseInt(totalRepairs.getText());
                 double  successfulFirstRepairs1  =Integer.parseInt(successfulFirstRepairs.getText());
                 double repeatRepairs1 = totalRepairs1-successfulFirstRepairs1;
                 double fFVRatio1 = successfulFirstRepairs1/totalRepairs1;
                 repeatRepairs.setText(new Double(repeatRepairs1).toString());
          totalRepairs.addActionListener(actionListener);
          successfulFirstRepairs.addActionListener(actionListener);
          KeyListener keyListener = new KeyListener() {
              public void keyPressed(KeyEvent e) { }
              public void keyReleased(KeyEvent e) { }
              public void keyTyped(KeyEvent e) {if ( ! Character.isDigit(e.getKeyChar())) {
                   Toolkit.getDefaultToolkit().beep();
                   e.consume();
            totalRepairs.addKeyListener(keyListener);
            successfulFirstRepairs.addKeyListener(keyListener);
          InputVerifier verifier = new InputVerifier() {
              public boolean verify(JComponent input) {
                final JTextComponent source = (JTextComponent) input;
                String text = source.getText();
                if (text.length() == 0) {
                  Runnable runnable = new Runnable() {
                    public void run() {
                      JOptionPane.showMessageDialog(source,
                          "Can't leave Blank.", "Error Dialog",
                          JOptionPane.ERROR_MESSAGE);
                  SwingUtilities.invokeLater(runnable);
                  return false;
                else {
                  return true;
            totalRepairs.setInputVerifier(verifier);
            successfulFirstRepairs.setInputVerifier(verifier);
public class BBB {
    public static void main(String[] args) {
        PiGUI piGUI = new PiGUI();
}