709. 转换成小写字母

题目链接：https://leetcode.cn/problems/to-lower-case/description/

ascii码应用

Java

class Solution {
    public String toLowerCase(String s) {
        char[] arr = s.toCharArray();
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] >= 'A' && arr[i] <= 'Z') {
                arr[i] = (char) (arr[i] + 32);
            }
        }
        return new String(arr);
    }
}