0290-word-pattern.java

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