面试题 01.09. 字符串轮转 

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class Solution {
    public boolean isFlipedString(String s1, String s2) {
        if (s1.length() != s2.length()) {
            return false;
        }

        String concatenatedStr = s2 + s2;
        return concatenatedStr.contains(s1);
    }
}

References

面试题 01.09. 字符串轮转