Scanner only reading first set of input

Question

This is a code I have developed to separate inputs by the block (when a space is reached):

import java.util.Scanner;
public class Single {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("Three Numbers:");
        String numbers = in.next();
        int length = numbers.length();
        System.out.println(length);
        int sub = length - length;
        System.out.println(sub);
        System.out.println(getNumber(numbers, length, sub));
        System.out.println(getNumber(numbers, length, sub));
        System.out.println(getNumber(numbers, length, sub));
    }
    public static double getNumber(String numbers, int length, int sub){
        boolean gotNumber = false;
        String currentString = null;
        while (gotNumber == false){
            if (numbers.substring(sub, sub + 1) == " "){
                sub = sub + 1;
                gotNumber = true;
            } else {
                currentString = currentString + numbers.substring(sub, sub);
                sub = sub + 1;
            }
        }
        return Double.parseDouble(currentString);
    }
}

However, it only reads the first set for the string, and ignores the rest. How can I fix this?

Vikrant Goel · Accepted Answer · 2013-10-27 23:27:05Z

1

The problem is here. You should replace this line

String numbers = in.next();

with this line

String numbers = in.nextLine();

because, next() can read the input only till the first space while nextLine() can read input till the newline character. For more info check this link.

answered Oct 27, 2013 at 23:27

Vikrant Goel

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Comments

peppermcknight · Accepted Answer · 2013-10-27 22:48:13Z

0

If I understand the question correctly, you are only calling in.next() once. If you want to have it process the input over and over again you want a loop until you don't have any more input.

while (in.hasNext()) {
    //do number processing in here
}

Hope this helps!

answered Oct 27, 2013 at 22:48

peppermcknight

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