Make Pyramids of Given Numbers using Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
public class NumberedPyramids
{
    public static void main(String[] args) throws Exception
    {
        BufferedReader in = new BufferedReader(new InputStreamReader(System. in ));
        System.out.print("Enter number of rows: ");
        int rows = Integer.parseInt( in .readLine());
        System.out.println("1-Print single numbered pyramid ?");
        System.out.println("2-Print pyramid by adding number ?");
        int select = Integer.parseInt( in .readLine());
        switch (select)
        {
            case 1:
                System.out.print("Enter number you want to print as pyramid: ");
                int p = Integer.parseInt( in .readLine());
                System.out.print("Here is your pyramid: ");
                for (int i = 0; i <= rows; i++)
                {
                    for (int j = 1; j <= i; j++)
                    {
                        System.out.print(p + "\t");
                    }
                    System.out.println("");
                }
                break;
            case 2:
                System.out.print("Enter number you want to print as pyramid: ");
                int x = Integer.parseInt( in .readLine());
                System.out.print("Here is your pyramid: ");
                int y = 0;
                for (int i = 0; i <= rows; i++)
                {
                    for (int j = 1; j <= i; j++)
                    {
                        System.out.print(y + "\t");
                        y = y + x; // you can also make pyramids by subracting, multiplying, dividing, etc
                    }
                    System.out.println("");
                }
                break;
            default:
                System.out.println("Wrong choice");
        }
    }
}