How to repeat something until correct input is given in java?

Question

I am trying to make a application and for one part of the application I need to get a input from the user stating how many times there click their mouse in 1 second. I want the

Answer 1

Use do while loop instead of while loop. This lets you run the loop atleast once before it tests the condition, where you can test the input.

String input = null;
do {
    //get the input from user
} while (isInputValid); //check input validity here

Example:

 Scanner input= new Scanner(System.in);
 do {
    System.out.println("Please enter the advertising cost: ");
    advertCost = input.nextDouble();

    } while (advertCost >= 100000 || advertCost <= 900000);

I have added link on how to validate inputs

Hope this helps!