LeetCode 344. Reverse String(反轉字符串)
阿新 • • 發佈:2018-05-05
length stringbu pro class 反轉字符串 reverse str pub string
題目描述
- LeetCode 344. 反轉字符串
- 請編寫一個函數,其功能是將輸入的字符串反轉過來。
示例
- 輸入: s = "hello"
- 返回:"olleh"
Code
Java
class Solution { public String reverseString(String s) { if (s == null || s.length() <= 1) { return s; } char[] arr = s.toCharArray(); int length = arr.length; for (int i = 0; i < length / 2; i++) { char temp = arr[i]; arr[i] = arr[length - i - 1]; arr[length - i - 1] = temp; } return String.valueOf(arr); //return new StringBuilder(s).reverse().toString(); } }
LeetCode 344. Reverse String(反轉字符串)