Untitled

import java.util.*;

public class WordPattern {
    public boolean wordPattern(String pattern, String s) {
        String[] words = s.split(" ");
        if (pattern.length() != words.length) {
            return false;
        }

        Map<Character, String> charToWord = new HashMap<>();
        Set<String> wordSet = new HashSet<>();

        for (int i = 0; i < pattern.length(); i++) {
            char c = pattern.charAt(i);
            String word = words[i];

            if (charToWord.containsKey(c)) {
                if (!charToWord.get(c).equals(word)) {
                    return false;
                }
            } else {
                if (wordSet.contains(word)) {
                    return false;
                }
                charToWord.put(c, word);
                wordSet.add(word);
            }
        }

        return true;
    }

    public static void main(String[] args) {
        WordPattern solution = new WordPattern();
        
        // Test cases
        System.out.println(solution.wordPattern("abba", "dog cat cat dog")); // true
        System.out.println(solution.wordPattern("abba", "dog cat cat fish")); // false
        System.out.println(solution.wordPattern("aaaa", "dog cat cat dog")); // false
    }
}