How to addActionListener to the code below?

[dragy]

Good day,

I have created the Applet but i don't know how to code the button to work or addActionListener. See below

import java.applet.Applet;
import java.awt.TextField;
import java.awt.Button;
import java.awt.Label;
import java.awt.Graphics;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
 
public class Vivz extends Applet implements ActionListener{
 
Label lblProduct;
Label lblPrice;
Label lblQuantity;
TextField txtProduct;
TextField txtPrice;
TextField txtQuantity;
Button btnCalculate;
 
String total = "";
 
public void init()
{
    lblProduct = new Label("Enter the product ");
    txtProduct = new TextField(20);
    lblPrice = new Label("Enter the price ");
    txtPrice = new TextField(20);
    lblQuantity = new Label("Enter the quantity ");
    txtQuantity = new TextField(20);
    btnCalculate = new Button("Calculate Invoice");
    btnCalculate.addActionListener(this);
 
 
    add(lblProduct);
    add(txtProduct);
    add(lblPrice);
    add(txtPrice);
    add(lblQuantity);
    add(txtQuantity);
    add(btnCalculate);
    add(lblResult);
    }
    public void actionPerformed(ActionEvent e)
    { 
 
 }
    }

[rajujrk]

Hi

        btnCalculate.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
 
                // Do your Action Here
 
            }
        });
 

Thanks
Raju