class Solution {
    public boolean wordPattern(String pattern, String str) {
        HashMap<Character, String> map1 = new HashMap<>();
        HashMap<String, Character> map2 = new HashMap<>();
        String[]word = str.split(" ");
        if(word.length!=pattern.length())return false;
        for(int i=0;i<pattern.length();i++){
            if(map1.containsKey(pattern.charAt(i)) && map1.get(pattern.charAt(i)).equals(word[i])==false)return false;
            if(map2.containsKey(word[i]) && map2.get(word[i])!=pattern.charAt(i))return false;
            map1.put(pattern.charAt(i), word[i]);
            map2.put(word[i], pattern.charAt(i));
        }
        return true;
    }
}