[JAVA]从键盘读入一个英文句子，翻转句子中单词的顺序，String的翻转算法

同 鹅厂编程题，剑指Offer编程题

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


/**
 * Created by 冬瓜 on 2016/9/2.
 */
public class SystemInTest {
public static void main(String[] args) {
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String str;
try {
str = stdin.readLine();
str = resverStr(str);
            String[] strs = str.split(" ");
            StringBuffer result = new StringBuffer();
for (String word:strs){
                result.append(resverStr(word)+" ");
            }
str = result.toString().trim();
            System.out.println(str);
            String str2 = "abcdefg";
            System.out.println(rotateString(str2,2));


        } catch (IOException e) {
            e.printStackTrace();
        }
    }

static String resverStr(String str){
if(str == null){
return null ;
        }
int length =str.length();
char[] array = str.toCharArray();
char temp  ;
for (int i=0;i<(length)/2;i++){
            temp = array[i];
            array[i]=array[length-1-i];
            array[length-1-i]=temp;
        }
return String.valueOf(array);
    }

static String rotateString(String str,int index){
if(str==null){
return null;
        }
        StringBuffer sbf = new StringBuffer();
        sbf.append(str);
        sbf.append(str);//任何字符串的旋转都是 sbf的字串 根据偏移量来subString就能直接拿到结果了
        String result = sbf.substring(index,str.length()+index);
return result;
    }
}