字符串循环右移K位

public class Main {

    public char[] reverse(char[] array, int b, int e) {
        char temp;
        for (; b < e; b++, e--) {
            temp = array[b];
            array[b] = array[e];
            array[e] = temp;
        }
        return array;
    }//reverse

    public String shift(String s, int k) {
        int n = s.length();
        char[] array = s.toCharArray();
        array = reverse(array, 0, n - k - 1);
        array = reverse(array, n - k, n - 1);
        array = reverse(array, 0, n - 1);
        return String.valueOf(ar