Check whether two strings are rotational equal or not

Check whether two strings are rotational equal or not (rotations of each other or not)

Given a string s1 and a string s2, check whether s2 is a rotation of s1

s1 = WXYZ and s2 = YZWX, return true, and

s1 = WXYZ, and s2 = XWYZ, return false.

Solution # 1

     public static boolean checkRotational(String str1, String str2) {

           int length = str1.length();

           if(length!=str2.length()) {

                return false;

           } else if(str1.equals(str2)) {

                return true;

           }

           for(int i=1;i<length;i++) {

                String s1 = str1.substring(0,1);

                String s2 = str1.substring(1, length);

                str1 = s2+s1;

                if(str2.equals(str1)) {

                     return true;

                }

           }

           return false;

     }

Best Solution # 2

     static boolean checkRotational(String str1, String str2) {

           str1 = str1+str1;

           if(str1.contains(str2)) {

                return true;

           } else {

                return false;

           }

     }