Reading a file and parsing the data for a calculation method

Question

i am trying to read a file with 3 feilds double double and int . am able to read the file but i am getting an exception right befor i parse the data ...code
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.*;
//import com.sun.java.util.jar.pack.Package.File;
public class FileTester {
public static String mLine;
     public static void main(String[] args) {
          BufferedReader in = null;
          try{
          File f = new File ("loan.txt.txt");
          in = new BufferedReader(new FileReader(f));
          catch(FileNotFoundException e)
               System.out.println("file does not exist");
               System.exit(0);
          try{
          String mLine = in.readLine();
          while (mLine != null){
               System.out.println(mLine);
               mLine = in.readLine();
          }}catch(Exception e)
          {System.out.println(e.getMessage());
          String []data = mLine.split("\t");
          double loan = Double.parseDouble(data[0]);
          double interest = Double.parseDouble(data[1]);
          int term = Integer.parseInt(data[2]);
          System.out.println(loan+interest+term);
afterwards i would like to break this up into three methods to feed the values to a calculation class

Answer 1

Take a look at your while loop. It continues to loop as long as mLine != null. Therefore it stops looping when mLine IS = null. So can you now see why the following line of code would cause problems?
String []data = mLine.split("\t");How is the data stored in your file? Is it a single line with the three values separated by a tab? If so you can do away with the while loop and just call readLine() once. Otherwise you will have to process each line you read inside the while loop.
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