public static void main(String[] args) throws IOException {
Path path = Paths.get("../alice.txt");
String contents = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
Stream<String> words = Stream.of(contents.split("[\\P{L}]+"));
show("words", words);
Stream<String> song = Stream.of("gently", "down", "the", "stream");
show("song", song);
Stream<String> silence = Stream.empty();
silence = Stream.<String>empty(); // Explicit type specification
show("silence", silence);
Stream<String> echos = Stream.generate(() -> "Echo");
show("echos", echos);
Stream<Double> randoms = Stream.generate(Math::random);
show("randoms", randoms);
Stream<BigInteger> integers = Stream.iterate(BigInteger.ONE, n -> n.add(BigInteger.ONE));
show("integers", integers);
Stream<String> wordsAnotherWay = Pattern.compile("[\\P{L}]+").splitAsStream(contents);
show("wordsAnotherWay", wordsAnotherWay);
try (Stream<String> lines = Files.lines(path, StandardCharsets.UTF_8)) {
show("lines", lines);
}
}
public static void main(String[] args) {
out.println("Gauss: " + MAX * (MAX + 1) / 2); // 500000500000
long sum = 0L;
for (long i = 0; i <= MAX; i++) {
sum = sum + i;
}
out.println("For loop: " + sum);
Long another =
Stream.iterate(0L, l -> ++l).limit(MAX + 1).collect(Collectors.summingLong(l -> l));
out.println("With a Stream of Long and Collectors.summingLong: " + another);
}
public static void main(String[] args) {
/*one way*/
Stream.iterate(0, n -> n + 1).map(n -> n + " ").limit(10).parallel().forEach(out::print);
out.println("");
}
public static long parallelSum(long n) {
return Stream.iterate(1L, i -> i + 1).limit(n).parallel().reduce(Long::sum).get();
}
public static long sequentialSum(long n) {
return Stream.iterate(1L, i -> i + 1).limit(n).reduce(Long::sum).get();
}
