Scanner method: hasNext()

[stdq]

Hi, everyone. I'm new to the forum, and I would to ask you how does the following program works. It uses Scanner method hasNext(), and a sample input/output is shown after the code.

import java.util.Scanner;
 
public class test_while_with_scanner_method_has_next
{
    public static void main(String[] args)
    {
        Scanner dataReceiver = new Scanner(System.in);
        int sum = 0;
        int value;
 
        while ( dataReceiver.hasNext() )
        {
            System.out.printf("Enter a value: ");
            value = dataReceiver.nextInt();
            sum += value;
        }
 
        System.out.printf("The sum is %d.", sum);
    }
}

Sample input/output at the command prompt, as soon as the program starts with command java test_while_with _scanner_method _has_next:

1
Enter a value: 3
Enter a value: 4
Enter a value: ^Z
The sum is 8.

^Z is the keystroke combination for indicating end-of-file. How is it possible that the first integer entered, 1, is included in the sum?

Thanks in advance! =]

[Rabbit]

Because the nextInt read in the 1.