左旋字符串

package 左移字符串;public class Solution {    public String LeftRotateString(String str,int n) {        if(str == null){            return str;        }        int len = str.length();        if(len == 0){            return str;        }        n = n % len;        return str.substring(n, len)+str.substring(0, n);    }    public static void main(String[] args){        System.out.println(new Solution().LeftRotateString("dfjk", ));    }}