Check rotation Java

PROGRAM TO CHECK IF STRINGS ARE ROTATIONS OF EACH OTHER OR NOT

class StringRotation

{

    /* Function checks if passed strings (str1 and str2)

       are rotations of each other */

    static boolean areRotations(String str1, String str2)

    {

        // There lengths must be same and str2 must be 

        // a substring of str1 concatenated with str1.  

        return (str1.length() == str2.length()) &&

               ((str1 + str1).indexOf(str2) != -1);

    }

      

    // Driver method

    public static void main (String[] args)

    {

        String str1 = "AACD";

        String str2 = "ACDA";

  

        if (areRotations(str1, str2))

            System.out.println("Strings are rotations of each other");

        else

            System.out.printf("Strings are not rotations of each other");

    }

}




OUTPUT

Strings are rotations of each other

CREDITS: https://www.geeksforgeeks.org/a-program-to-check-if-strings-are-rotations-of-each-other/