Thread: Is this correct.Am I close? Help please

Current problem only includes addition function. Here is what i did..is this correct for my problem where I need to modify it to include buttons and calculation for multiplication,division and subtraction.?

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class BasicCalculator {
private static final int FRAME_WIDTH = 150;
private static final int FRAME_HEIGHT = 120;
 
// Keeps track of the current operation (subtract, add, etc)
private static final int NO_OPERATION = 0;
private static final int ADDITION = 1;
public static int operation = NO_OPERATION;
 
public static JTextField textFieldDisplay;
public static double Value1 = 0; // holds the value before the operation
 
public static void main(String[] args) {
// Set up the user interface
JFrame frame = new JFrame();
JPanel buttonPanel = new JPanel();
frame.add(buttonPanel);
 
// create two buttons, plus and equal and a text box for answers
textFieldDisplay = new JTextField(10);
buttonPanel.add(textFieldDisplay);
JButton buttonPlus = new JButton(" + ");
buttonPanel.add(buttonPlus);
JButton buttonEqual = new JButton(" = ");
buttonPanel.add(buttonEqual);
 
frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setTitle("Basic Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
frame.setVisible(true);
 
 
// called when the equal sign '=' is pressed
class EqualSignListener implements ActionListener {
 
public void actionPerformed(ActionEvent event)
{
double Value2 = Double.parseDouble(textFieldDisplay.getText());
if (operation == ADDITION) {
// plus sign pressed before the equal sign
Value2 += Value1;
}
// Convert from a answer to a string
Double answer = new Double(Value2);
textFieldDisplay.setText( answer.toString() );
// Reset the operation to show no current operation
operation = NO_OPERATION;
}
}
 
// called when a plus sign '+' is pressed
class PlusSignListener implements ActionListener {
public void actionPerformed(ActionEvent event)
{
Value1 = Double.parseDouble(textFieldDisplay.getText());
operation = ADDITION;
}
}
 
// Add the methods that will be called when these buttons are pressed
ActionListener plusSignListener = new PlusSignListener();
buttonPlus.addActionListener(plusSignListener);
 
ActionListener equalSignListener = new EqualSignListener();
buttonEqual.addActionListener(equalSignListener);
 
}
}
// called when a subtraction sign '-' is pressed
class SubtractionSignListener implements ActionListener {
public void actionPerformed(ActionEvent event)
{
Value1 = Double.parseDouble(textFieldDisplay.getText());
operation = Subtraction;
}
}
 
// Add the methods that will be called when these buttons are pressed
ActionListener subtractionSignListener = new SubtractionSignListener();
buttonPlus.addActionListener(subtractionSignListen er);
 
ActionListener equalSignListener = new EqualSignListener();
buttonEqual.addActionListener(equalSignListener);
}
)
// called when a division sign '/' is pressed
class DivisionSignListener implements ActionListener {
public void actionPerformed(ActionEvent event)
{
Value1 = Double.parseDouble(textFieldDisplay.getText());
operation = DIVISION;
}
}
 
// Add the methods that will be called when these buttons are pressed
ActionListener divisionSignListener = new DivisionSignListener();
buttonPlus.addActionListener(plusSignListener);
 
ActionListener equalSignListener = new EqualSignListener();
buttonEqual.addActionListener(equalSignListener);
}
) 
// called when a plus sign '*' is pressed
class MulitplicationSignListener implements ActionListener {
public void actionPerformed(ActionEvent event)
{
Value1 = Double.parseDouble(textFieldDisplay.getText());
operation = Multiplication;
}
}
 
// Add the methods that will be called when these buttons are pressed
ActionListener multiplicationSignListener = new MultiplicationSignListener();
buttonPlus.addActionListener(plusSignListener);
 
ActionListener equalSignListener = new EqualSignListener();
buttonEqual.addActionListener(equalSignListener);
 
}
}

Is this thread the same as: http://www.javaprogrammingforums.com...ification.html

Please only use one thread for a problem.