NumberFormatException trying to parse " 66" to an integer

Question

So i have this slice of code that reads text from a csv file where nums[] goes throughout the file and stores the number of a said student, and grades[][] goes through and stores each of their grades:

 Scanner sc = new Scanner(new FileReader("location.csv"));
    String [][] stuff = new String [10][];
    for(int i = 0; i<10; i++){
    String line = sc.nextLine();
    stuff[i] = line.split.(",");
 }
  int [][] grades = new int [10][10];
  int [] nums = new int [10];

  for(int x = 0; x<10; x++){
     nums[x] = Integer.parseInt(stuff[x][0]);
     System.out.println(nums[x]);
      for(int y = 0; y<11; y++){
      grades[x][y] = Integer.parseInt(stuff[x][y]);
    }
}

The problem is that numbs works wonderfully, but grades cant store any value that is past the first column of data. If I set grades [x][y] = stuff[any number] [0] it will run, but if I try to go past 0 in the rows, I error terminate.

Part of data file:

1, 66, 82, 85, 87, 65, 80, 97, 75, 68, 72

2, 70, 63, 75, 62, 84, 65, 67, 95, 81, 96

3, 100, 98, 73, 78, 69, 75, 97, 66, 61, 90

4, 75, 62, 79, 78, 87, 73, 74, 76, 63, 84

5, 81, 90, 80, 66, 75, 96, 73, 77, 66, 87

Stack Trace: java.lang.NumberFormatException: For input string: " 66"

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Integer.parseInt(Integer.java:481)

at java.lang.Integer.parseInt(Integer.java:527)

Fixed Code ( I apologize, I did not copy the code verbatim and included a few extra errors in it)

public static void main(String[] args)throws FileNotFoundException

{

    Scanner sc = new Scanner(new FileReader("location.csv"));
    String [][] values = new String [10][];
    for(int i = 0; i<10; i++){
    String line = sc.nextLine();
    values[i] = line.split(",");
 }
  int [][] grades = new int [10][10];
  int [] nums = new int [10];

   for(int x = 0; x<10; x++){
     nums[x] = Integer.parseInt(values[x][0]);
     System.out.println(nums[x]);
      for(int y = 0; y<10; y++){
      grades[x][y] = Integer.parseInt(values[x][y+1].trim());

    }

}

Answer 1

You aren't getting rid of the whitespace between tokens.

Make sure to clear it, preferably with String#trim()

Integer.parseInt(stuff[x][0].trim());

---

For the record, I'd also look to use better names than stuff.

Answer 2

Also, you're going to get an index out of bounds when you fix those other errors:

     for( int y = 0; y < 11; y++ )
        grades[x][y] = Integer.parseInt( stuff[x][y] );

All your array indexes go to 10, which in Java means 0 through 9. y here will go to 10, so boom out of bounds.

Considering the syntax errors pointed out in the comments, please in the future copy and paste the EXACT code you are using. It'll be no good if we are debugging different code than what you are actually using.