Java - Rotate the digits in a Number

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Here is the Java Source code to rotate the digits in a Number.

Source Code

import java.io.*;

import java.lang.*;

class RotateNumber {   

      public static void RotateNumber(long number)

      {

            long start = number;

            int numdigits = (int) Math.log10((double)number); // would return numdigits - 1

            int multiplier = (int) Math.pow(10.0, (double)numdigits);

            //System.out.println(numdigits);

            //System.out.println(multiplier);

            while(true)

            {

                  long q = number / 10;

                  long r = number % 10;

                  //1234 = 123;

                  number = number / 10;

                  number = number + multiplier * r;

                  System.out.println(number);

                  if(number == start)

                        break;

            }

      }

    public static void main(String[] args) {

            String inpstring = "";

            InputStreamReader input = new InputStreamReader(System.in);

            BufferedReader reader = new BufferedReader(input);

            try

            {

                  System.out.println("Enter a Number to Rotate:");

                  inpstring = reader.readLine();

                  long number = Long.parseLong(inpstring, 10);

                  RotateNumber(number);

            }

            catch (Exception e)

            {

                  e.printStackTrace();

            }

    }

Output

D:\Program Files\Java\jdk1.6.0_23\bin>Java RotateNumber

Enter a Number to Rotate:

5643218

8564321

1856432

2185643

3218564

4321856

6432185

5643218