Java Program to Print Pascal's Triangle

public class PascalsTriangle {
    public static void main(String[] args) {
        int rows = 5, coef = 1;

        for(int i = 0; i < rows; i++) {
            for(int space = 1; space < rows - i; ++space) {
                System.out.print("  ");
            }

            for(int j = 0; j <= i; j++) {
                if (j == 0 || i == 0)
                    coef = 1;
                else
                    coef = coef * (i - j + 1) / j;

                System.out.printf("%4d", coef);
            }

            System.out.println();
        }
    }
}

           1
         1   1
       1   2   1
     1   3   3   1
   1   4   6   4   1