Handling files with different sizes of content (please help)!

Question

Hi,
I have a written a program to tell customers how much certain apartments are to rent.
It asks the reader to input a floor number and the number of bedrooms in the apartment. I then returns the price.
The contents of the file look like this:
0 400 450 510
1 500 560 630
2 625 676 740
3 1000 1250 1600
the first column of numbers refer to the floor number (0-3) and the following columns relate to the prices of bedrooms. The first is 0 rooms, then 1 room, then 2 rooms.
So a one bedroom appartment on the 0th (ground) floor would be 450.
This program works perfectly for this set of data and returns the correct answer. What i want to try and do is make it work with different sets of data
e.g more floors and moree rooms. up to an unlimited number of both
Can anyone help me with this because im not sure how.
heres the code
import java.io.*;
import java.util.Vector;
public class FlatCost
    public static void main(String[] args) throws IOException    {
        FileInputStream stream = new FileInputStream(args[0]);
        InputStreamReader reader = new InputStreamReader(stream);
        StreamTokenizer tokens = new StreamTokenizer(reader);       
        Vector v = new Vector();
        while(tokens.nextToken() != tokens.TT_EOF)        {           
            v.add(new Integer((int) tokens.nval));
            System.out.println(new Integer((int) tokens.nval));       
        System.out.println("Enter floor number: ");       
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String line1 = in.readLine();
        int x = Integer.parseInt(line1);
        if(x > 3) System.out.println("Sorry, out of range");
        System.out.println("Enter no. rooms: ");       
        String line2 = in.readLine();          
        int y = Integer.parseInt(line2);
        if(y > 2) System.out.println("Sorry, out of range");
        int numFloors = v.size()/4;               
        int dest = ((x*4) + y + 1);
        System.out.println("PRICE: " + v.get(dest));   
}Thanks
Sarah x

Answer 1

Try this
import java.io.*;
import java.util.ArrayList;
public class FlatCost
  ArrayList floors = new ArrayList();
  public FlatCost()
    try
      readDataFromFile();
      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
      int floor;
      int rooms;
      String another = "y";
      while(another.equalsIgnoreCase("y"))
        System.out.print("\nEnter floor number (0 for ground): ");
        floor = Integer.parseInt(in.readLine());
        if(floor < 0 || floor > floors.size())
          System.out.println("floor out of range, try again");
        else
          System.out.print("\nEnter no. rooms: ");
          rooms = Integer.parseInt(in.readLine());
          if(rooms < 1 || rooms > ((String[])floors.get(floor)).length)
            System.out.println("rooms out of range, try again");
          else
            System.out.println("\nThe cost of a "+rooms+"-room flat is $"+
                                   ((String[])floors.get(floor))[rooms]);
            System.out.print("\nAnother? (y/n): ");
            another = in.readLine();
    catch(Exception e){System.out.println("error - terminating");}
  public void readDataFromFile() throws Exception
    BufferedReader br = new BufferedReader(new FileReader("FlatData.txt"));
    String line = "";
    while((line = br.readLine()) != null) floors.add(line.split(" "));
    br.close();
  public static void main(String[] args){new FlatCost();}
}