findNotMatching.java

    public static List<String> findNotMatching(String sourceStr, String anotherStr){
        String new_souce = sourceStr.replaceAll("[^a-zA-Z ]", "").toLowerCase();
        anotherStr = anotherStr.replaceAll("[^a-zA-Z ]", "").toLowerCase();

        StringTokenizer at = new StringTokenizer(new_souce, " ");
        StringTokenizer bt = null;
        int i = 0, token_count = 0;
        String token = null;
        boolean flag = false;
        List<String> missingWords = new ArrayList<String>();
        while (at.hasMoreTokens()) {
            token = at.nextToken();
            bt = new StringTokenizer(anotherStr, " ");
            token_count = bt.countTokens();
            while (i < token_count) {
                String s = bt.nextToken();
                if (token.equals(s)) {
                    flag = true;
                    break;
                } else {
                    flag = false;
                }
                i++;
            }
            i = 0;
            if (flag == false) {
                missingWords.add(token);
            }
        }
        return missingWords;
    }