Example usage for java.util.stream Collectors toList

Introduction

In this page you can find the example usage for java.util.stream Collectors toList.

Prototype

public static <T> Collector<T, ?, List<T>> toList()

Source Link

Document

Returns a Collector that accumulates the input elements into a new List .

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Path path = Paths.get("E:\\Java_Dev");

    List<Path> files = Files.walk(path).filter(Files::isReadable).filter(Files::isRegularFile).limit(10)
            .collect(Collectors.toList());
    System.out.println(files);//from  w w  w . ja v  a2s .c o  m
}

From source file:Main.java

public static void main(String[] args) {
    List<String> names = Arrays.asList("Chris", "HTML", "XML", "CSS", "");

    Stream<String> s = names.stream().filter(name -> name.startsWith("C"));

    List<String> collect = s.filter(Objects::nonNull).collect(Collectors.toList());
    System.out.println(collect);/*from   ww w .  j a v a  2  s. c o m*/
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    List<Person> persons = Arrays.asList(new Person("Max", 18), new Person("Peter", 23),
            new Person("Pamela", 23), new Person("David", 12));

    List<Person> filtered = persons.stream().filter(p -> p.name.startsWith("P")).collect(Collectors.toList());

    System.out.println(filtered); // [Peter, Pamela]
}

From source file:Main.java

public static void main(String[] args) {
    Map<Employee.Gender, List<String>> namesByGender = Employee.persons().stream().collect(Collectors
            .groupingBy(Employee::getGender, Collectors.mapping(Employee::getName, Collectors.toList())));

    System.out.println(namesByGender);
}

From source file:Main.java

public static void main(String[] argv) {
    List<Person> persons = new ArrayList<>();
    persons.add(new Person("Joe", 12));
    persons.add(new Person("Jim", 34));
    persons.add(new Person("John", 23));

    List<Person> list = persons.stream().filter(p -> p.getAge() > 18).collect(Collectors.toList());
    list.forEach(p -> System.out.println(p.getFirstName()));

}

From source file:Main.java

public static void main(String[] args) {
    List<String> names = Arrays.asList("Chris", "HTML", "XML", "CSS", "");

    Stream<String> s = names.stream();

    Predicate<String> isEmpty = String::isEmpty;
    Predicate<String> notEmpty = isEmpty.negate();

    System.out.println(s.filter(notEmpty).collect(Collectors.toList()));
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> result = Stream.of(2, 3, 4, 5).peek(x -> System.out.println("taking from stream: " + x))
            .map(x -> x + 17).peek(x -> System.out.println("after map: " + x)).filter(x -> x % 2 == 0)
            .peek(x -> System.out.println("after filter: " + x)).limit(3)
            .peek(x -> System.out.println("after limit: " + x)).collect(Collectors.toList());

    System.out.println(result);//from  w  ww. j  ava2 s  .  c o m
}

From source file:Main.java

public static void main(String[] argv) {
    List<DayOfWeek> list = new ArrayList<>();

    list = (List<DayOfWeek>) Stream.of(Month.values()).map(month -> LocalDate.now().withYear(2010).with(month)
            .with(TemporalAdjusters.lastDayOfMonth()).getDayOfWeek()).collect(Collectors.toList());

    System.out.println(list);//  w w w  .  j av a  2  s .  c  om
}

From source file:Main.java

public static void main(String[] args) {
    List<Person> roster = createRoster();

    System.out.println("Names of male members with collect operation: ");
    List<String> namesOfMaleMembersCollect = roster.stream().filter(p -> p.getGender() == Person.Sex.MALE)
            .map(p -> p.getName()).collect(Collectors.toList());

    namesOfMaleMembersCollect.stream().forEach(p -> System.out.println(p));

}

From source file:Main.java

public static void main(String[] args) {
    List<Person> roster = createRoster();

    System.out.println("Names by gender:");
    Map<Person.Sex, List<String>> namesByGender = roster.stream().collect(
            Collectors.groupingBy(Person::getGender, Collectors.mapping(Person::getName, Collectors.toList())));

    List<Map.Entry<Person.Sex, List<String>>> namesByGenderList = new ArrayList<>(namesByGender.entrySet());

    namesByGenderList.stream().forEach(e -> {
        System.out.println("Gender: " + e.getKey());
        e.getValue().stream().forEach(f -> System.out.println(f));
    });//from w  w  w  .  j a v  a2 s. c om

}