字符串逆序输出

Posted 2022-12-16 唐 昊

使用StringBuilder的方式

 public static String form(String arr)
        LocalDateTime begin = LocalDateTime.now();
        StringBuilder stringBuilder = new StringBuilder();
        StringBuilder append = stringBuilder.append(arr);
        StringBuilder reverse = append.reverse();
        System.out.println(reverse);
        LocalDateTime end = LocalDateTime.now();
        System.out.println(Duration.between(begin,end).toMillis());
        return reverse.toString();
    

常规截取字符拼装

 public static String reverse(String str)
        char[] chars = str.toCharArray();
        String  res = "";
        for (int i = chars.length -1; i >= 0; i--) 
            res += chars[i];
        
        return res.toString();