protected void writeEventStream(Payload payload) throws IOException { PrintStream printStream = new PrintStream(response.outputStream()); try (Stream<?> stream = (Stream<?>) payload.rawContent()) { stream.forEach( item -> { String jsonOrPlainString = (item instanceof String) ? (String) item : TypeConvert.toJson(item); printStream .append("data: ") .append(jsonOrPlainString.replaceAll("[\n]", "\ndata: ")) .append("\n\n") .flush(); }); } }
public static void main(String... args) { List<Integer> numbers = Arrays.asList(3, 4, 5, 1, 2); Arrays.stream(numbers.toArray()).forEach(System.out::println); int calories = Dish.menu.stream().mapToInt(Dish::getCalories).sum(); System.out.println("Number of calories:" + calories); // max and OptionalInt OptionalInt maxCalories = Dish.menu.stream().mapToInt(Dish::getCalories).max(); int max; if (maxCalories.isPresent()) { max = maxCalories.getAsInt(); } else { // we can choose a default value max = 1; } System.out.println(max); // numeric ranges IntStream evenNumbers = IntStream.rangeClosed(1, 100).filter(n -> n % 2 == 0); System.out.println(evenNumbers.count()); Stream<int[]> pythagoreanTriples = IntStream.rangeClosed(1, 100) .boxed() .flatMap( a -> IntStream.rangeClosed(a, 100) .filter(b -> Math.sqrt(a * a + b * b) % 1 == 0) .boxed() .map(b -> new int[] {a, b, (int) Math.sqrt(a * a + b * b)})); pythagoreanTriples.forEach(t -> System.out.println(t[0] + ", " + t[1] + ", " + t[2])); }