Patterns:
=========

class DiamondPattern{
    public static void main(String[] args)
    {
        int rows = 6;
        int spaces = rows - 1;
        // upper triangle
        for(int r = 1;r <= rows;r++)
        {
            // for space printing
            for(int s = 1;s <= spaces;s++)
            {
                System.out.print(" ");
            }
            spaces--;
            for(int c = 1;c <= 2 * r - 1;c++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
        spaces = 1;
        // lower triangle
        for(int r = 1;r <= rows-1;r++)
        {
            for(int s = 1;s <= spaces;s++)
            {
                System.out.print(" ");
            }
            spaces++;
            for(int c = 1;c <= 2*(rows-r) - 1;++c)
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}
==============================================

class InvertedPyramidPattern{
    public static void main(String args[])
    {
        int rows = 7;
        // int space = 0;
        for(int i = 1;i <= rows;i++)
        {
            for(int s = 1;s <= i;s++)
            {
                System.out.print(" ");
            }
            // space++;
            for(int j = 1;j <= 2*(rows-i)-1;j++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

=============================================

class PascalTrianglePattern{
    public static void main(String[] args)
    {
        int row = 5;
        for(int r = 1;r <= row;r++)
        {
            for(int c = 1;c <= r;c++)
            {
                System.out.print("* ");
            }
            System.out.println();
        }
        for(int r = row-1;r >= 1;r--)
        {
            for(int c = 1;c <= r;c++)
            {
                System.out.print("* ");
            }
            System.out.println();
        }
    }
}