1684. Count the Number of Consistent Strings

class Solution {
    public int countConsistentStrings(String allowed, String[] words) {
        HashMap<Character , Integer> ans = new HashMap<>();
        for(char ch : allowed.toCharArray()){
            ans.put(ch , 0);
        }
        int res = 0;
        for(int i = 0 ; i < words.length ; i++){
            boolean check = true;
            for(int j = 0 ; j < words[i].length() ; j++){
                
                if(!ans.containsKey(words[i].charAt(j))){
                    check = false;
                    break;
                }
            }
            if(check){
                res++;
            }
        }
        return res;
    }
}