反转字符串
反转字符串
http://www.nowcoder.com/questionTerminal/c3a6afee325e472386a1c4eb1ef987f3
简单易懂版本，利用双指针实现反转字符串
import java.util.*;
public class Solution {
/**
* 反转字符串
* @param str string字符串
* @return string字符串
*/
public String solve (String str) {
// write code here
if(str.length() <= 1)
return str;
int left = 0;
int right = str.length()-1;
char[] chars = str.toCharArray();
while(left < right){
char c = chars[right];
chars[right] = chars[left];
chars[left] = c;
left++;
right--;
}
return new String(chars);
}
} 
