How do I exit a while loop by pressing enter?

Question

I am trying to get a while loop to break by pressing the Enter key on a keyboard. My code is:

package javaapplication4;
import java.util.ArrayList         


        

Answer 1

import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;

public class JavaApplication4 {

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        ArrayList numbers = new ArrayList();
        System.out.println("Please enter the numbers seperated by a space: ");

        String line = keyboard.nextLine();
        StringTokenizer token = new StringTokenizer(line, " ");
        while(token.hasMoreTokens()) {
            numbers.add(Double.parseDouble(token.nextToken()));
        }

        System.out.println("Numbers: " + numbers);

    }

}