How to add Action Listener in Java

Action Listener have a utility to listen every action performed on a particular component.
For Example (Purpose: Result=Operator1+Operator2):

Result of source code:




Source Code

import java.util.Scanner;

public class Pyramid {

    public static void main(String[] args) {
        int _heightpiramid = 1;
        Scanner sc = new Scanner(System.in);
        System.out.println("Tutorial make pyramid in Java");
        System.out.println("-----------------------------");
        System.out.print("Entry height of pyramid : ");
        _heightpiramid = sc.nextInt();
        System.out.println("Result                       : ");
        for (int x = 0; x < _heightpiramid; x++) {
            for (int z = (_heightpiramid - 1) - x; z > 0; z--) {
                System.out.print(" ");
            }
            for (int y = 0; y <= x; y++) {
                System.out.print("*");
            }
            for (int y = 1; y <= x; y++) {
                System.out.print("*");
            }

            System.out.print("\n");
        }

    }
}

Note :
1. Entry a Operator 1 and Operator 2 Field

I hope this tutorial can help you..^^