Java Question: Why the heck is this not working?

It compiles but when it runs i get an exception error: (I am trying numbers from a file, get the sum and then average it) This is what I have so far:


import java.util.Scanner;


import java.io.File;


import java.io.IOException;





public class Average{


public static void main(String[]args)


{


int count=0;


long sum=0;


Scanner in=null;





File F= new File("C:\\Users\\Owner\\Documents\\My Documents\\JAVA\\Lesson 13\\numbers.txt");





try{


in= new Scanner(F);





while (in.hasNext()){


String number = in.nextLine();


sum=sum + Long.parseLong(number);





count++;





}


} catch(IOException i){


System.out.println("Error: File does not exist");


}


}





}


//This is the exception error I get:


Exception in thread "main" java.lang.NumberFormatException: For input string: " 2"


at java.lang.NumberFormatException.forInput...


at java.lang.Long.parseLong(Long.java:403)


at java.lang.Long.parseLong(Long.java:java:...


at Average.

Java Question: Why the heck is this not working?
Yes there is a space before the 2 in the string...





quick hack fix would be to do this ...





replace


String number = in.nextLine();


with


String number = in.nextLine().trim();
Reply:Try





sum=sum + Long.parseLong(number.trim());
Reply:There's a space character before number 2, and it's getting in the way of converting it from string to a number. Check your numbers.txt, second line.





Try to trim the string first, before converting.





Good luck!