Exemplo n.º 1
0
  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);
    }
  }
Exemplo n.º 2
0
 public static void main(String[] args) {
   Personne[] tab = {
     new Personne("thibault", "Rougier", 2001),
     new Personne("thomas", "Niesseron", 1987),
     new Personne("thifaine", "Mitenne", 1959),
     new Personne("maxime", "Forest", 1995),
     new Personne("jules", "Forest", 1995)
   };
   System.out.println("--- Nes apres 1985 : ");
   Stream.of(tab)
       .filter(pp -> pp.getAnnee() > 1985)
       .forEach(pp -> System.out.print(pp.getPrenom() + ", "));
   System.out.println("\n--- Nes avant 2000 :");
   long nombre =
       Stream.of(tab)
           .filter(pp -> pp.getAnnee() < 2000)
           .sorted(Comparator.comparing(Personne::getNom))
           .peek(pp -> System.out.print(pp.getNom() + " "))
           .count();
   System.out.println("\n       Ils sont " + nombre);
   System.out.println("--- Tous tries sur nom + prenom : ");
   Stream.of(tab)
       .sorted(Comparator.comparing(pp -> pp.getNom() + pp.getPrenom()))
       .forEach(pp -> System.out.print("(" + pp.getNom() + ", " + pp.getPrenom() + ") "));
 }
Exemplo n.º 3
0
  public static void main(String[] args) {

    Map<Integer, HashSet<String>> withSet =
        Stream.of("jon", "andrew", "harvey", "bil")
            .collect(Collectors.groupingBy(String::length, HashSet::new));
    out.println(withSet);
  }
Exemplo n.º 4
0
 static <T> Stream<T> inOrder(Tree<T> tree) {
   if (tree.isLeaf()) {
     return Stream.of(tree.getValue());
   } else {
     final List<Node<T>> children = tree.getChildren();
     return children
         .tail()
         .foldLeft(Stream.<T>empty(), (acc, child) -> acc.appendAll(inOrder(child)))
         .prepend(tree.getValue())
         .prependAll(inOrder(children.head()));
   }
 }
Exemplo n.º 5
0
 static <T> Stream<T> preOrder(Tree<T> tree) {
   return tree.getChildren()
       .foldLeft(Stream.of(tree.getValue()), (acc, child) -> acc.appendAll(preOrder(child)));
 }