Reading and printing from a file

Question

I have a method that reads temperatures from a data file and prints them to the monitor. I use a while loop to read each line of the file, but for some reason it doesnt skip the loop when readLine returns null. My question is how do i get the method to stop reading before it returns null...
   public static void printFile(String textFile) throws IOException
        String inputString="";
        BufferedReader inputDataFile=
        new BufferedReader(new FileReader(CENTIGRADE_DATA_FILE));
        while(inputString!=null)
            inputString= inputDataFile.readLine();
            System.out.println(inputString);
        inputDataFile.close();
   

Answer 1

ok cool thanks for pointing that out guys i appreciate it...now i need to take those temps and convert them from Strings to doubles so they can be converted i tried this but im getting a NumberFormatException error...
public static void buildReport() throws IOException
        double centigradeTemp=0.00;
        String inputTemp="";
        //Open centigrade temps to be read and converted
        BufferedReader inputDataFile=
        new BufferedReader(new FileReader(CENTIGRADE_DATA_FILE));
        //Open file writer to write report
        PrintWriter outFile=new PrintWriter(new FileWriter("TempReport.txt"));
        //While loop to read a temp, convert it, and write it in the report
        while((inputTemp= inputDataFile.readLine())!=null)
            centigradeTemp=Integer.parseInt(inputTemp);           
            outFile.println(fahrenheit(centigradeTemp));
        outFile.close();
    public static double fahrenheit(double centigrade)
        double fahrenTemp=0.00;
        fahrenTemp=(9/5)*centigrade + 32;
        return fahrenTemp;