public class Solution {    public boolean WordPattern(String pattern, String str) {        String[] s=str.split(" ");        if(pattern.length()!=s.length) return false;        for(int i=0;i<pattern.length();i++) {            for(int j=0;j<i;j++) {                if((pattern.charAt(i)!=pattern.charAt(j)&&s[i].equals(s[j]))|(pattern.charAt(i)==pattern.charAt(j)&&!s[i].equals(s[j]))) return false;            }        }        return true;    }}