Question

I am trying to get a valid input of “y”, “Y”, “n” , or “N”.

If the input is not valid (for example any word that starts with a “y” or “n”) I want it to re-prompt the user for input.

So far I have:

while  (again.charAt(0) != 'N' && again.charAt(0) != 'n' && again.charAt(0) !='Y' && again.charAt(0) != 'y' ) {
    System.out.println ("Invalid Inpur! Enter Y/N");
    again = numscan.next();
}

if (again.charAt(0)== 'N' || again.charAt(0) == 'n') {
    active = false;                   
} else {
    if (again.charAt(0)== 'Y' || again.charAt(0) == 'y'){
        active = true;
        random = (int) (Math.random () *(11));
    }
}

The problem I am having is if I enter any word that starts with the letter “y” or “n” it senses it as valid input (since it is the character at slot 0). I need help fixing this so I can re-prompt the user when they enter a word that starts with a “y” or “n”.

Thanks!

Answer 1

Assuming again is a string containing the complete user input, you could use:

while (!again.equals("N") && !again.equals("n") ...

The .equals() method will match only if the entire string matches.