java中的字符串反转

本文主要讲述java中的字符串反转

示例代码如下：

 1 public class HomeWork01 {
 2     public static void main(String[] args) {
 3         String s = "abcdef";
 4         // edcbaf
 5         String reverse = null;
 6         try {
 7             reverse = reverse(s, -01, 4);
 8             System.out.println(reverse);
 9         } catch (RuntimeException e) {
10             System.out.println(e.getMessage());
11         }
12     }
13 
14     // 指定位置开始反转字符串
15     public static String reverse(String str,int start,int end) {
16         if(str == null){
17             throw new RuntimeException("str不能为空串");
18         }
19         if(start < 0){
20             throw new RuntimeException("start输入错误");
21         }
22         if(end >= str.length()){
23             throw new RuntimeException("end不能超过str的长度");
24         }
25         if(start >= end){
26             throw new RuntimeException("start比end小，无法反转");
27         }
28         char[] chars = str.toCharArray();
29         for(int i = start,j = end;i < j;i++,j--){
30             char ch = chars[i];
31             chars[i] = chars[j];
32             chars[j] = ch;
33         }
34         String s = new String(chars);
35         return s;
36 
37     }
38 }