题解 | #反转字符串#

记录

import java.util.*;


public class Solution {
    /**
     * 反转字符串
     * @param str string字符串 
     * @return string字符串
     */
    public String solve (String str) {
        // write code here
        if (str == null || str.length() <= 1){
            return str;
        }
        char[] chars = str.toCharArray();
        int len = chars.length;
        for (int i = 0; i < len / 2; i++){
            char temp = chars[i];
            chars[i] = chars[len - i - 1];
            chars[len - i - 1] = temp;
        }
        return new String(chars);
    }

}