WordPatternClever.java

// Reference: https://leetcode.com/problems/word-pattern/discuss/73402/8-lines-simple-Java
public boolean wordPattern(String pattern, String str) {
		String[] words = str.split(" ");
		if (words.length != pattern.length())
			return false;
		Map index = new HashMap();
		for (Integer i=0; i<words.length; ++i)
			if (index.put(pattern.charAt(i), i) != index.put(words[i], i))
				return false;
		return true;
	}