for(int i = 1; i <= 9; i++)
{
    //print spaces
    for (int j = 0; j < #spaces; j++)
        System.out.print(" ");
    //print digits (need to print i digits)
    for (int j = 1; j < i; j++)
        System.out.print(digit);
    //print spaces
    for (int j= 1; j < #spaces; j++)
        System.out.print(" ")
    System.out.println();
}