判断一个字符串经过左旋转之后，是否对称

public static void main(String[] args) {
    System.out.println(methodC("abccbazx"));
    System.out.println(methodC("abccbaz"));
    System.out.println(methodD("abccbazx",0));
    System.out.println(methodD("abccbaz",0));

}


//方法A，判断一个字符串是否对称
private static boolean methodA(String str) {
    if (str == null)
        return false;
    StringBuffer buffer = new StringBuffer(str);
    return str.equals(buffer.reverse().toString());
}

//方法B，左旋转一个字符一次
private static String methodB(String str) {
    if (str == null)
        return null;
    StringBuffer buffer = new StringBuffer(str);
    int index = 0;
    while (index < str.length()) {
        if(index == str.length()-1){
            buffer.setCharAt(index, str.charAt(0));
            break;
        }
        buffer.setCharAt(index, str.charAt(index + 1));
        index++;
    }
    System.out.println("loop:"+buffer.toString());
    return buffer.toString();
}

//方法C，用遍历的方式
private static boolean methodC(String str) {
    int i = 0;
    boolean flag = false;
    String temp = str;
    do {
        flag = methodA(temp);
        if (flag)
            return flag;
        temp = methodB(temp);
        i++;
    } while (i < str.length());
    return flag;
}

//方法D，用递归的方式
private static boolean methodD(String str,int count) {
    boolean flag = false;
    flag = methodA(str);
    if (flag || count == str.length()-1)
        return flag;
    count++;
    return methodD(methodB(str),count);
}