(The code must be done in Java and can only use RECURSION.)

Find the sum of digits of a positive integer number

Sum = number itself if (number is a single digit)

otherwise sum = the last digit of the number + the sum of rest of the digits of the number.

Use this method: public int sumOfDigits(int number)

Test this method with following input numbers: 0, 101, 1, 231214, 734