Question

I’m having trouble setting up and placing values into an array using a text file containing the floating point numbers 2.1 and 4.3 each number is separated by a space – below is the error I’m getting:

Exception in thread “main” java.util.NoSuchElementException

import java.util.*;
import java.io.*;

public class DoubleArray {

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

        Scanner in = new Scanner(new FileReader("mytestnumbers.txt"));

        double [] nums = new double[2];

        for (int counter=0; counter < 2; counter++) {
            int index = 0;
            index++;
            nums[index] = in.nextDouble();
        }
    }
}

Thanks, I’m sure this isn’t a hard question to answer… I appreciate your time.

Answer 1

You should always use hasNext*() method before calling next*() method

    for (int counter=0; counter < 2; counter++) {
       if(in.hasNextDouble(){ 
           nums[1] = in.nextDouble();
       }
    }

but I think you are not doing the right, I’d rather

    for (int counter=0; counter < 2; counter++) {
       if(in.hasNextDouble(){ 
           nums[counter] = in.nextDouble();
       }
    }

NoSuchElementException is thrown by nextDouble method @see javadoc