字符串之反转字符串

package org.learn.str;

/**
 * 将字符数组进行翻转
 *
 * @author holly
 * @link <a href="https://leetcode.cn/problems/reverse-string/">翻转字符串</a>
 *     <p>
 *     编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。
 *
 *     不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。
 *
 *     你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。
 *
 *     示例 1： 输入：["h","e","l","l","o"] 输出：["o","l","l","e","h"]
 *
 *     示例 2： 输入：["H","a","n","n","a","h"] 输出：["h","a","n","n","a","H"]
 *
 *     #
 *     </p>
 */
public class ReverseString {

    public static void main(String[] args) {
        String str = "abc";
        char[] chars = str.toCharArray();
        reverseString(chars);
        System.out.println(chars);
    }

    /**
     * 翻转字符串
     *
     * @param chars char数组
     */
    public static void reverseString(char[] chars) {
        int l = 0;
        int r = chars.length - 1;
        while (l < r) {
            char temp = chars[l];
            chars[l] = chars[r];
            chars[r] = temp;
            l++;
            r--;
        }
    }
}