This is the question I need to code in Java and im not sure how to do it:

Takes the four least significant digits in the number provided as an argument, adds them * together, and returns the result.

Example: when the argument num has value 2489634 * then this function should return 4 + 3 + 6 + 9 = 20.

* @param num the integer that we use to compute the sum of the four least significant digits.

* @return the sum of the four least significant digits in num