1832. 判断句子是否为全字母句

1832. 判断句子是否为全字母句

class Solution {
    public boolean checkIfPangram(String sentence) {
        char[] chars = sentence.toCharArray();
        int[] flag = new int[30];
        for (char aChar : chars) {
            flag[aChar - 'a'] ++;
        }
        for (int i = 0; i < 26; i++) {
            if (flag[i] == 0) return false;
        }
        return true;
    }
}