几种将字符串头尾翻转的方法

￡神魔★判官ぃ 2022-07-19 05:21 172阅读 0赞

方法一:
    public static String reverse1(String s) {
      int length = s.length();
      if (length <= 1)
       return s;
      String left = s.substring(0, length / 2);
      String right = s.substring(length / 2, length);
      return reverse1(right) + reverse1(left);
     }
    方法二:
    public static String reverse2(String s) {
      int length = s.length();
      String reverse = "";
      for (int i = 0; i < length; i++)
       reverse = s.charAt(i) + reverse;
      return reverse;
    }
    方法三:
    public static String reverse3(String s) {
      char[] array = s.toCharArray();
      String reverse = "";
      for (int i = array.length - 1; i >= 0; i--)
       reverse += array[i];
      
      return reverse;
    }
    方法四:
     public static String reverse4(String s) {
      return new StringBuffer(s).reverse().toString();
     }
    方法五:
    public static String reverse5(String orig) {
      char[] s = orig.toCharArray();
      int n = s.length - 1;
      int halfLength = n / 2;
      for (int i = 0; i <= halfLength; i++) {
       char temp = s[i];
       s[i] = s[n - i];
       s[n - i] = temp;
      }
      return new String(s);
     }
    方法六:
    public static String reverse6(String s) {
      
      char[] str = s.toCharArray();
      
      int begin = 0;
      int end = s.length() - 1;
      
      while (begin < end) {
       str[begin] = (char) (str[begin] ^ str[end]);
       str[end] = (char) (str[begin] ^ str[end]);
       str[begin] = (char) (str[end] ^ str[begin]);
       begin++;
       end--;
      }
      
      return new String(str);
     }
    方法七:
    public static String reverse7(String s) {
      char[] str = s.toCharArray();
      Stack<Character> stack = new Stack<Character>();
      for (int i = 0; i < str.length; i++)
       stack.push(str[i]);
      
      String reversed = "";
      for (int i = 0; i < str.length; i++)
       reversed += stack.pop();
      
      return reversed;
    }