Use java programming for the following questions to have the solutions ready within today Jan 3 2020 at or before 8:00PM GMT+8 time zone:

Question 7

Write a method countLines(String inFilename) of a class FileUtility which reads a binary byte file with name inFilename using FileInputStream. The method returns the no. of lines containing comments starting with "//" with optional spaces (but not other characters) before it. Each line is terminated by ' '. You may write other methods if necessary. Handle possible exception by outputting a suitable message if an exception occurs.