pyramid of numbers using for loops

/*
 Generate Pyramid For a Given Number Example
 This Java example shows how to generate a pyramid of numbers for given
 number using for loop example.
 */

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class GeneratePyramidExample {

    public static void main(String[] args) throws Exception {
        BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter Number:");
        int as = Integer.parseInt(keyboard.readLine());
        System.out.println("Enter X:");
        int x = Integer.parseInt(keyboard.readLine());
        int y = 0;
        for (int i = 0; i <= as; i++) {

            for (int j = 1; j <= i; j++) {
                System.out.print(y + "\t");
                y = y + x;
            }
            System.out.println("");
        }
    }
}
/*
 Output of this example would be
 Enter Number:
 5
 Enter X:
 1
 0
 1 2
 3 4 5
 6 7 8 9
 10 11 12 13 14
 ----------------------------------------------
 17
 Enter Number:
 5
 Enter X:
 2
 0
 2 4
 6 8 10
 12 14 16 18
 20 22 24 26 28
 ----------------------------------------------
 Enter Number:
 5
 Enter X:
 3
 0
 3 6
 9 12 15
 18 21 24 27
 30 33 36 39 42
 */