Java port of Python gist

WordLimit.java

class WordLimit {

    public static void main(String args[]) {

        assert(limit("cat dog", 3) == "cat");
        assert(limit("cat", 3) == "cat");
        assert(limit("cat ", 4) == "cat");
        assert(limit("cat dog", 5) == "cat");
        assert(limit("cat dog bird", 10) == "cat dog");
        assert(limit("cat", 9) == "cat");
    }

    public static String limit(String s, int max) {
        if (s.length() <= max) {
            return s;
        }
        for (int i=max-1; i >= 0; i--) {
            if (s.charAt(i) == ' ') {
                max = i;
                break;
            }
        }
        return s.substring(0, max);
    }
}