write a simple java program using methods (for beginners)

Problem 2 ( 20 points) (Sum the digits in an integer) Write a method that computes the sum of the digits in an integer. Use the following method header: public static int sumDigits(long n) For example, sumDigits (234) returns 9(=2+3+4). (Hint: Use the % operator to extract digits and the / operator to remove the extracted digit. For instance, to extract 4 from 234 , use 234%10(=4). To remove 4 from 234, use 234/10 (=2 3 ). Use a loop to repeatedly extract and remove the digit until all the digits are extracted. Write a test program that prompts the user to enter an integer then displays the sum of all its digits