[LeetCode] Problem 709 - To Lower Case

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

Example

No.1

Input: “Hello”

Output: “hello”

No.2

Input: “here”

Output: “here”

No.3

Input: “LOVELY”

Output: “lovely”

Code

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public String toLowerCase(String str) {
    char[] ch = str.toCharArray();

    for (int i = 0; i < ch.length; i++) {
        if (ch[i] >= 'A' && ch[i] <= 'Z')
            ch[i] -= 'A' - 'a';
    }
    
    return String.valueOf(ch);
}