Read a $2-$character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true if the following conditions are met:

userString does not contain two of the same character.

For alphabetic characters, userString does not contain two of the same letter $($regardless of case$).$

Otherwise, assign isValid with false.

Ex: If the input is m$\%,$ then isValid is assigned with true, so the output is:

String accepted

Ex: If the input is Rr$,$ then isValid is assigned with false, so the output is:

String not accepted import java.util.Scanner;

public class StringChecker $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($System$.$in$)$;

String userString;

if $($isValid$)\{$

System.out.println$("$String accepted"$)$;

$\}$

else $\{$

System.out.println$("$String not accepted"$)$;