java字符串左移或右移几位（三次反转思想）

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代码

public class StringReversal {    /**     * 反转字符串（循环交换）     * 其他字符串反转的方法     * 1、java的api：StringBuffer的reverse方法     * 2、利用栈的特性（先进后出）     * 3、反向遍历字符串     * @param from     * @return     */    public static String reChange(String from){        char[] froms = from.toCharArray();        int length = froms.length;        for (int i = 0; i < length/2; i++){            char temp = froms[i];            froms[i] = froms[length - 1 -i];            froms[length - 1 -i] = temp;        }        return String.valueOf(froms);    }    /**     * 循环左移index位字符串     * 思想：先部分反转，后整体反转     * @param from     * @param index     * @return     */    public static String leftMoveIndex(String from,int index){        String first = from.substring(0,index);        String second = from.substring(index);        first = reChange(first);        second = reChange(second);        from = first + second;        from = reChange(from);        return from;    }    /**     * 循环右移index位字符串     * 思想：先整体反转，后部分反转     * @param from     * @param index     * @return     */    public static String rightMoveIndex(String from,int index){        from = reChange(from);        String first = from.substring(0,index);        String second = from.substring(index);        first = reChange(first);        second = reChange(second);        from = first + second;        return from;    }    public static void main(String[] args) {        String leftString = "abcdefg";        System.out.println("左移2位字符串结果："+leftMoveIndex(leftString,2));        String rightString = "abcdefg";        System.out.println("右移2位字符串结果："+rightMoveIndex(rightString,2));    }}

输出结果

左移2位字符串结果：cdefgab右移2位字符串结果：fgabcde

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