code: public static boolean isZip(String fName)
    {
      if (Strings.isNullOrEmpty(fName)) {
        return false;
      }
      return fName.endsWith(ZIP_SUFFIX); // Technically a file named `.zip` would be fine
    }
docs: Checks to see if fName is a valid name for a "*.zip" file
  
  @param fName The name of the file in question
  
  @return True if fName is properly named for a .zip file, false otherwise