public void readFile(String fileNameIn) throws FileNotFoundException {
      try {
		  Scanner file = new Scanner(new File(fileNameIn));
		  String name;
		  double bandwidth, mfc, time, modemcost, datalimit;
		  while (file.hasNext()) {
			 Scanner line = new Scanner(file.nextLine());
			 line.useDelimiter(",");
			 switch (line.next().charAt(0)) {
				case 'W':
				   name = line.next();
				   bandwidth = Double.parseDouble(line.next());
				   mfc = Double.parseDouble(line.next());
				   modemcost = Double.parseDouble(line.next());
				   WiFi wifi = new WiFi(name, bandwidth, mfc, modemcost);
				   addWirelessNetwork(wifi);
				   break;
				case 'C':
				   name = line.next();
				   bandwidth = Double.parseDouble(line.next());
				   mfc = Double.parseDouble(line.next());
				   time = Double.parseDouble(line.next());
				   datalimit = Double.parseDouble(line.next());
				   Cellular cell = new Cellular(name, bandwidth, mfc,
						 time, datalimit);
				   addWirelessNetwork(cell);
				   break;
				case 'L':
				   name = line.next();
				   bandwidth = Double.parseDouble(line.next());
				   mfc = Double.parseDouble(line.next());
				   time = Double.parseDouble(line.next());
				   datalimit = Double.parseDouble(line.next());
				   LTE lte = new LTE(name, bandwidth, mfc, time, datalimit);
				   addWirelessNetwork(lte);
				   break;
				case 'F':
				   name = line.next();
				   bandwidth = Double.parseDouble(line.next());
				   mfc = Double.parseDouble(line.next());
				   time = Double.parseDouble(line.next());
				   datalimit = Double.parseDouble(line.next());
				   FiveG g = new FiveG(name, bandwidth, mfc, time, datalimit);
				   addWirelessNetwork(g);
				   break;
				default:
				   String badData = file.nextLine();
				   addInvalidRecord(badData);
				   throw new Invalidcategoryexception("Invalid category exception")
				   break;
			 }
		  }
		}
		catch(NumberFormatException nfe) {
			//print "number format exception"
		}
		catch(Nosuchelementexception nsee) {
			//print "No such element"
		}
		catch(Invalidcategoryexception ice) {
			//print "Invalid category"
		}
   }