JLabel and text concept issues

Basically I want to display the output with a JLabel from the text fields where the data is entered, and when the Calculate button is pressed to display this output. Here is what I have so far but I feel I'm kind of off track a bit.

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TextFrame extends JFrame implements ActionListener{

private static final int FRAME_WIDTH = 300;
private static final int FRAME_HEIGHT = 200;
private static final int FRAME_X_ORIGIN = 150;
private static final int FRAME_Y_ORIGIN = 250;

private static final int BUTTON_WIDTH = 80;
private static final int BUTTON_HEIGHT = 30;

private static final double SHIPPING = 0.12;

private JButton calculateTotal;
private JLabel prompt;
private JLabel prompt2;
private JLabel display;
private JLabel display2;

private JTextField inputLine;
private JTextField inputLine2;
private JTextField inputLine3;

public static void main(String[] args) {

TextFrame frame = new TextFrame();
frame.setVisible(true);

}

public TextFrame() {


Container contentPane;

setSize(FRAME_WIDTH, FRAME_HEIGHT);
setResizable(false);
setTitle("Project");
setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN);

contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());

prompt = new JLabel( );
prompt.setText("Enter ID Code: ");
prompt.setSize(150,25);
contentPane.add(prompt);

inputLine = new JTextField( );
inputLine.setColumns(10);
contentPane.add(inputLine);

prompt2 = new JLabel( );
prompt2.setText("Weight: Pounds | Ounces: ");
prompt2.setSize(150,25);
contentPane.add(prompt2);

inputLine2 = new JTextField( );
inputLine2.setColumns(5);
contentPane.add(inputLine2);

inputLine3 = new JTextField( );
inputLine3.setColumns(5);
contentPane.add(inputLine3);

inputLine.addActionListener(this);
inputLine2.addActionListener(this);
inputLine3.addActionListener(this);

calculateTotal = new JButton("Calculate");
calculateTotal.setSize(BUTTON_WIDTH, BUTTON_HEIGHT);
contentPane.add(calculateTotal);

display = new JLabel( );
display.setText(" ID Weight Shipping Charge ");
display.setSize(150,25);
contentPane.add(display);

String idcode = inputLine.getText();
String pounds = inputLine2.getText();
String ounces = inputLine3.getText();

display2 = new JLabel( );
display2.setText(idcode);
display2.setSize(150,25);
contentPane.add(display2);



calculateTotal.addActionListener(this);

setDefaultCloseOperation(EXIT_ON_CLOSE);

}

public void actionPerformed(ActionEvent event) {


if (event.getSource() instanceof JButton) {
JButton clickedButton = (JButton) event.getSource();




} else {
setTitle("You entered '" + inputLine.getText() + "'");
}


}



}



Any Help would be very much appreciated.

Thanks,

- GoOsE

Code:

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TF extends JFrame implements ActionListener {
    private static final int FRAME_WIDTH = 300;
    private static final int FRAME_HEIGHT = 200;
    private static final int FRAME_X_ORIGIN = 150;
    private static final int FRAME_Y_ORIGIN = 250;

    private static final int BUTTON_WIDTH = 80;
    private static final int BUTTON_HEIGHT = 30;

    private static final double SHIPPING = 0.12;

    private JButton calculateTotal;
    private JLabel prompt;
    private JLabel prompt2;
    private JLabel display;
    private JLabel display2;

    private JTextField inputLine;
    private JTextField inputLine2;
    private JTextField inputLine3;

    public static void main(String[] args) {
        TF frame = new TF();
        frame.setVisible(true);
    }

    public TF() {
        Container contentPane;

        setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setResizable(false);
        setTitle("Project");
        setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN);

        contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());

        prompt = new JLabel( );
        prompt.setText("Enter ID Code: ");
        prompt.setSize(150,25);
        contentPane.add(prompt);

        inputLine = new JTextField( );
        inputLine.setColumns(10);
        contentPane.add(inputLine);

        prompt2 = new JLabel( );
        prompt2.setText("Weight: Pounds | Ounces: ");
        prompt2.setSize(150,25);
        contentPane.add(prompt2);

        inputLine2 = new JTextField( );
        inputLine2.setColumns(5);
        contentPane.add(inputLine2);

        inputLine3 = new JTextField( );
        inputLine3.setColumns(5);
        contentPane.add(inputLine3);

        inputLine.addActionListener(this);
        inputLine2.addActionListener(this);
        inputLine3.addActionListener(this);

        calculateTotal = new JButton("Calculate");
        calculateTotal.setSize(BUTTON_WIDTH, BUTTON_HEIGHT);
        contentPane.add(calculateTotal);

        display = new JLabel( );
        display.setText(" ID Weight Shipping Charge ");
        display.setSize(150,25);
        contentPane.add(display);

//        String idcode = inputLine.getText();
//        String pounds = inputLine2.getText();
//        String ounces = inputLine3.getText();

        display2 = new JLabel( );
//        display2.setText(idcode);
        display2.setSize(150,25);
        contentPane.add(display2);

        calculateTotal.addActionListener(this);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public void actionPerformed(ActionEvent event) {
        // If this is all you're going to do in this method then
        // you don't need to find out which component sent the event.
        // You can do this for any event received:
        String idcode = inputLine.getText();
        String pounds = inputLine2.getText();
        String ounces = inputLine3.getText();
        String s = "ID Code: " + idcode + ", " + pounds + " pounds " +
                    ounces + " ounces";
        display2.setText(s);
       
//        if (event.getSource() instanceof JButton) {
//            JButton clickedButton = (JButton) event.getSource();
//        } else {
//            setTitle("You entered '" + inputLine.getText() + "'");
//        }
    }
}

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