Create a Java static method named averageOfEven that takes an array of integers as a parameter and returns a double value representing the average of the values in the array that are even numbers. Your method must work for an int array of any size. Example: If the array contains [13, 48, 16, 99], the method would return (48 + 16) / 2 = 32 as double value.

Hint: the amount of even numbers need to be counted. Example values should not appear in your code.