Word Pattern.java

class Solution {
    public boolean wordPattern(String pattern, String s) {
        String[] arr=s.split(" ");
         if(pattern.length()!=arr.length) return false;
        Map<Character,String> map=new HashMap<Character,String>();
        
        for(int i=0;i<pattern.length();i++){
            char ch=pattern.charAt(i);
            if(map.containsKey(ch)){
                 if(!map.get(ch).equals(arr[i])){
                    return false;
                }    
            }else if(!(map.containsKey(ch)|| map.containsValue(arr[i]))){
               map.put(ch,arr[i]);
            }else{
                return false;
            }
        }
        return true;
    }
}