HELP!! ERROR IN reading from file!! (PART of )PROGRAM

Question

Take a look at my program first....
import java.io.*;
public class reading_file {
public static void main(String[] args) throws IOException {
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
String [] sType= new String[10];
int [] sNum= new int[10];
float [] sPrice= new float[10];
String FileName="new.txt";
BufferedReader inFile=new BufferedReader(new FileReader(FileName));
String inputLine="";
int totalLines=0;
while(inFile.readLine()!=null){
totalLines++;
int totalStock=totalLines/3;
System.out.println(totalStock);
for(int i=0; i<totalStock;i++){
sType=inFile.readLine();
System.out.println(sType[i]);
sNum[i] =Integer.parseInt(inFile.readLine());
System.out.println(sNum[i]);
sPrice[i] =Float.parseFloat(inFile.readLine());
System.out.println(sPrice[i]);
inFile.close();
I am reading the info from the file to the respective array shown.
e.g these are the info in the .txt file
/////=>
PANTS
35
23.3
LOGITECH CORDLESS DESKTOP
200
50.23
MONITER
62
54.9
<=
but when i run the program the errors such as :
==>
compile-single:
run-single:
3
null
Exception in thread "main" java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at reading_file.main(reading_file.java:26)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
why is that??
any mistake in the program??

Answer 1

You could mark the start of the file with the mark method from BufferedReader, but you'd best check that this is ok to do with a call to the bufferedreader markSupported method. This method will return true if you are able to mark the reader. You have to include an int parameter with the mark method that is bigger than the file size. In your case this will be easy since the file is small. Then before the second reading, call reset( ) on your buffered reader.
Personally, I wouldn't use arrays but would use an arraylist. Also, I'd have the 3 bits of information entered into a single object and store all the information (contained within the single object) into a single arraylist. Since the arraylist has a variable size, you don't need to know its size in advance, and you don't have to worry about reading through a file twice. Once will do nicely.