Mooc Helsinki Part 1 Week 4 Exercise 18 Java Weird Occurrence-CodePudding

Having a problem here with this error which the solution to is simply beyond me.

FAIL: PersonalInformationCollectionTest testInputFirst Something weird occurred. It could be that the void main (String[] args) method of the class class PersonalInformationCollection has disappeared or your program crashed due to an exception. More information: java.util.NoSuchElementException.

It then says the same thing but for testInputSecond as well.

Can't find any reason for whats wrong. Looked online at a correct solution and perhaps it's just my poor eye sight but i couldn't see a single difference between my somehow incorrect code and their correct code.

Thanks for any help in advance.


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

public class PersonalInformationCollection {

    public static void main(String[] args) {
        // implement here your program that uses the PersonalInformation class

        ArrayList<PersonalInformation> infoCollection = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("First name: ");
            String firstName = scanner.next();

            if (firstName.isEmpty()){
                break;
            }
            System.out.println("Last name: ");
            String lastName = scanner.next();
            System.out.println("Identification number: ");
            String idNumber = scanner.next();
            infoCollection.add(new PersonalInformation(firstName, lastName, idNumber));
        }
        for (PersonalInformation personalInfo : infoCollection){
            System.out.println(personalInfo.getFirstName()   " "    personalInfo.getLastName());
        }

    }
}

CodePudding user response：

You can try to use scanner.hasNext(). Please check the java documentation for Scanner#hasNext()
Scanner#next() can throw NoSuchElementException - if no more tokens are available

while (scanner.hasNext()) {
    System.out.println("First name: ");
    String firstName = scanner.next();
    System.out.println("Last name: ");
    String lastName = scanner.next();
    System.out.println("Identification number: ");
    String idNumber = scanner.next();
    infoCollection.add(new PersonalInformation(firstName, lastName, idNumber));
}

CodePudding user response：

Solved by using scanner.nextLine() rather than scanner.next(). No idea how that made such a difference in this case