leetcode-709-To-Lower-Case

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描述

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

Example 1:

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Input: "Hello"
Output: "hello"

Example 2:

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Input: "here"
Output: "here"

Example 3:

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Input: "LOVELY"
Output: "lovely"

分析

使用 Java 来解决的话，需要先把字符串转换为字符数组，遍历字符数组，把大写字母转换为小写字母

解决方案1(Java)

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class Solution {
    public String toLowerCase(String str) {
        char[] result = str.toCharArray();
        for (int i = 0; i < result.length; i++) {
            if ('A' <= result[i] && result[i] <= 'Z') {
                result[i] = (char) (result[i] - 'A' + 'a');
            }
        }
        return new String(result);
    }
}

题目来源