JZ43 左旋转字符串

8:40 -8:53

str.length() 字符串的length 需要加 （） 才可以

public class Solution {
    public String LeftRotateString(String str,int n) {
        char[] chars = str.toCharArray();
        char[] res = new char[str.length()];
        int j =n;
        for (int i=0; i < str.length(); i++,j++){
            if( j >  str.length()-1){ j = 0;}
            res[i] = chars[j];
        }

        return new String(res);
    }
}