LeetCode-Reverse String

Description：
Write a function that takes a string as input and returns the string reversed.

Example 1:

Input: “hello”
Output: “olleh”

Example 2:

Input: “A man, a plan, a canal: Panama”
Output: “amanaP :lanac a ,nalp a ,nam A”

题意：将给定的字符串反序输出；

解法：使用StringBuilder对象，将字符串中的字符逆序输入到StringBuilder对象中；

Java

class Solution {
    public String reverseString(String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = s.length() - 1; i >= 0 ; i--) {
            sb.append(s.charAt(i));
        }
        return sb.toString();
    }
}