java-8-stream-processing-example.java

    public List<String> randomDictionaryWords() throws IOException {
        try (InputStream is = new FileInputStream(new File("/usr/share/dict/words"))) {
            BufferedReader br = new BufferedReader(new InputStreamReader(is));

            return br.lines()
                    .filter(line -> line.length() >= MIN_WORD_LENGTH && line.length() <= MAX_WORD_LENGTH)
                    .filter(word -> word.equals(word.toLowerCase()))
                    .filter(word -> random() < DICTIONARY_SAMPLING_RATE)
                    .limit(50)
                    .collect(Collectors.toList());
        }
    }

    private String createRandomWord(List<String> dictionary) {
        return IntStream.range(0, randomInt(MAX_WORDS_PER_PHRASE) + 1)
                .mapToObj(i -> dictionary.get(randomInt(dictionary.size())))
                .collect(Collectors.joining("-"));
    }