Doubt about Scanner class

Question

Why on creating an object of Scanner class in a loop gives an error?

Answer 1

In simple way get soo many inputs from user

ArrayList<Integer> obj = new ArrayList<>();

Scanner sc = new Scanner(System.in);

while(sc.hasNextInt())
{
obj.add(sc.nextInt());
}

Answer 2

Can't find the code in your profile so it's hard to answer.

What are you trying to do, spawn multiple objects? Each time your loop runs, a new object is created - if the name is the same you'll encounter a runtime exception.

Try declaring the Scanner object outside the loop and only change its value inside of it

Scanner sc = new Scanner(System.in);
String response;

while(true) {

response = sc.nextLine();

if(response.equalsIgnoreCase("quit")
break;
}

Answer 3

Because if you create a new object on loop iteration it won't have a new name like ob1,ob2...

So it will be ob 1st time, ob next time and so on....

So multiple objects with same name would create an error...