Java字符串反向输出的函数

在Java中，有多种方法可以反转字符串：

1. **使用StringBuilder或StringBuffer的reverse()方法**:

   String originalStr = "Hello, World!";
   StringBuilder sb = new StringBuilder(originalStr);
   String reversedStr = sb.reverse().toString(); // 或 StringBuffer 可以替换 StringBuilder
   System.out.println(reversedStr); // 输出 "!dlroW ,olleH"

2. **使用Character数组**:

   String originalStr = "Hello";
   char[] charArray = originalStr.toCharArray();
   int start = 0, end = charArray.length - 1;
   while (start < end) {
       char temp = charArray[start];
       charArray[start] = charArray[end];
       charArray[end] = temp;
       start++;
       end--;
   }
   String reversedStr = new String(charArray);
   System.out.println(reversedStr);

3. **递归方法**:

   public static String reverse(String str) {
       if (str.isEmpty()) return str;
       return reverse(str.substring(1)) + str.charAt(0);
   }
   String originalStr = "Java";
   String reversedStr = reverse(originalStr);
   System.out.println(reversedStr);