Java Scanner, Arraylist and while loop

Question

I am trying a to get user input and add the value in Arraylist as long it is positive number. If user enters a negative number the program should stop. This is my code it take up to three numbers then stops. Thank you in advance.

class ProjectOne{

public void counterLoop() {
    Scanner userNumber = new Scanner(System.in);
    ArrayList<Integer> number = new ArrayList();

    System.out.println("Enter Your No: ");
    number.add(userNumber.nextInt());

    while (true){
        System.out.println("Enter a number: ");
        number.add(userNumber.nextInt());
        System.out.println(number);

        if (userNumber.nextInt() >= 0){
            break;
        }
    }
}

}

ok? and what is your actual question? You have a codebase to start from, you know what must change. What is stopping you? try in your if, to change userNumber.nextInt() to number, since you already read the number — Stultuske
– Stultuske, Commented Jan 28, 2021 at 10:59

nehacharya · Accepted Answer · 2021-01-28 11:14:51Z

2

public void counterLoop() {
    Scanner userNumber = new Scanner(System.in);
    ArrayList<Integer> number = new ArrayList<>();
    while (true) {
        System.out.println("Enter a number: ");
        int n = userNumber.nextInt();
        if(n >= 0)
            number.add(n);
        else break;
    }
}

You should add the number to the list iff it is >= 0. If a negative number is input, the loop should break. You can print your list to see the result,

for(int i : number)
   System.out.print(i + " ");

edited Jan 28, 2021 at 11:14

answered Jan 28, 2021 at 11:05

nehacharya

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1 Comment

H.K Over a year ago

Thank you very much. It works like a dream :)

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