public static void printPattern(int n) {
    int m =1;
    int k=1;
    while (m-1-1 <=n) {
        int numberOfWhiteSpaces = n -1;
        for (int i = numberOfWhiteSpaces; i >= 0; i--) {
            System.out.print(" ");
        }
        for (k=m; k>0; k--) {
            System.out.print( k + "");
        }
        System.out.println();
        m++;
        n--;
    }
}

printPattern(3);

1
  21
 321

System.out.print( k + "");

System.out.print( k + " ");