(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 (= 23). 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 and displays the sum of all its digits.