LeetCode / To Lower Case

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class Solution {
    public String toLowerCase(String str) {
        char[] charArry = str.toCharArray();
        for (int i = 0; i < charArry.length; i++) {
            charArry[i] = getLower(charArry[i]);
        }
        return new String(charArry);
    }
    
    private boolean isUpper(char c) {
        return (c >= 'A') && (c <= 'Z');
    }
    
    private char getLower(char c) {
        if (isUpper(c)) {
            return (char)((c - 'A') + 'a');
        } else {
            return c;
        }
    }
}