Question

Everytime I run this code, the console goes into an infinite loop printing “Please input a number”. I do not understand why this is happening. Thanks in advance.

    boolean check = true;
    int temp = 0;
    while(check==true){
        try{

            temp= asker.nextInt();
            check = false;
        }
        catch(InputMismatchException e){
            System.out.println("Please input a number.");
        }
    }

Edit: asker is a Scanner. The purpose of the code is to loop until an integer is inputted by the user.

Answer 1

The method asker.NextInt() is throwing an InputMismatchException, indicating that the input received from asker (assuming it’s a Scanner) isn’t actually an integer. This exception causes the loop to restart without setting check to false.

Print the exception within the catch block to get more information about the failure. But most likely, you’re feeding your application something (lots and lots of something, if it’s looping like that) that doesn’t actually contain integer values.