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

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 + " ");

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