1.2原串翻转

 1 class Reverse {
 2 public:
 3     string reverseString(string iniString) {
 4         // write code here
 5         int strLen = iniString.size();
 6         if(strLen < 0)
 7         {
 8             return NULL;
 9         }
10         int left = 0;
11         int right = strLen-1;
12         char ch;
13         for (; left <right;)
14         {
15             ch = iniString[left];
16             iniString[left] = iniString[right];
17             iniString[right] = ch;
18             ++left;
19             --right;
20         }
21         return iniString;
22     }
23 };

 1 import java.util.*;
 2 public class Reverse
 3 {
 4     public String reverseString(String iniString)
 5     {
 6         StringBuilder sb = new StringBuilder(iniString);
 7         int low = 0;
 8         int high = iniString.length() - 1;
 9         char temp = ‘\0‘;
10 
11         while(low < high)
12         {
13             temp = sb.charAt(low);
14             sb.setCharAt(low, sb.charAt(high));
15             sb.setCharAt(high, temp);
16             low++;
17             high--;
18         }
19         return sb.toString();
20     }
21 }