Creating random numbers

[sjoelsteen156]

Hi. I just started programming Java two weeks ago and I am starting to get the basics (I think).
But now I have written a program (in Eclipse) and I get errors which I don't understand.
Has anybody got an idea of what is wrong with this code? (I want to create some numbers
in between -1 and 1 and add them up).

import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.File;
import java.util.Random;

public class Randomnesstester_class {

	public static void main(String[] args) 
	throws FileNotFoundException{
		
		Random myRandom = new Random();
		Scanner diskScanner = new Scanner(new File("Randomnessfile"));
		Scanner myScanner = new Scanner(System.in);
		System.out.println("How many numbers do you want to be created?");
		int numberOfNumbers = 0;
		numberOfNumbers = myScanner.nextInt();
		int counter = 0;
		int number = 0;
		int sum = 0;
		
		while (counter < numberOfNumbers) {
			number = myRandom.nextInt(3)-1;
			counter = counter + 1;
		}
		
		counter = 0;
		number = 0;
		
		while (counter < numberOfNumbers) {
			number = diskScanner.nextInt();
			sum = sum + number;
			counter = counter + 1;
		}
		
		System.out.println("The sum of the " + numberOfNumbers + "randomly created numbers is " + sum + ".");

	}

}

The error messages I get are the next ones (I copied the console view):
How many numbers do you want to be created?
20
Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at Randomnesstester_class.main(

Randomnesstester_class.java:33)

Thanks in advance =)

[DarrylBurke]

... and I get errors which I don't understand.

Would you like to tell us more about those errors, or would you prefer members to play a guessing game?

Whenever seeking help with any error, copy and post the entire error text; don't paraphrase.

db

[sjoelsteen156]

I am sorry, I tried my best to do put it properly now (edited the first reply).

[PhQ]

Your code works fine for me.
I believe you need to add some ints into the Randomnessfile.
This is what I put into the file:

20
30
60

Edit: Also instead of doing counter = counter + 1; you can do counter++;

[sjoelsteen156]

Thank you for your help, I saw what I did wrong...
I forgot to write to the file (using PrintStream)..
Stupid of me I did not see it before...

And the counter++ is a very good solution, thanks for that.