Example usage for java.util List stream

Introduction

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

Prototype

default Stream<E> stream()

Source Link

Document

Returns a sequential Stream with this collection as its source.

Usage

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    Optional<Integer> sum = numbers.stream().reduce(Integer::sum);
    if (sum.isPresent()) {
        System.out.println(sum.get());
    } else {//from  w w  w  . ja va  2  s . co  m
        System.out.println("noValue ");
    }

}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numberList = Arrays.asList(1, 2, 3, 4, 5);
    Stream<Integer> listStream = numberList.stream();

    System.out.println(Arrays.toString(listStream.toArray()));
}

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"));

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

From source file:Main.java

public static void main(String[] args) {
    List<Integer> _numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
    Object[] doubled = _numbers.stream().map(value -> value * 2).toArray();

    System.out.println(Arrays.toString(doubled));
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);

    ///*from www.  j a v  a2 s  . com*/

    System.out.println(numbers.stream().filter(i -> i > 2).filter(i -> i % 2 == 0).mapToInt(i -> i * i)
            .findFirst().getAsInt());
}

From source file:Main.java

public static void main(String[] args) {
    List<String> stringList = Arrays.asList("2", "1", "3", "4");

    Optional<String> m = stringList.stream().min(Comparator.reverseOrder());
    if (m.isPresent()) {
        System.out.println(m.get());
    } else {//w  w w .ja  v  a2s  . c o m
        System.out.println("No Value");
    }

}

From source file:Main.java

public static void main(String[] args) {
    List<String> stringList = Arrays.asList("2", "1", "3", "4");

    Optional<String> m = stringList.stream().max(Comparator.reverseOrder());
    if (m.isPresent()) {
        System.out.println(m.get());
    } else {//w  ww.  ja  v a2s. c  o  m
        System.out.println("No Value");
    }

}

From source file:Main.java

public static void main(final String[] args) {
    List<String> friends = Arrays.asList("Ross", "Chandler", "CSS", "Monica", "Joey", "Rachel");

    friends.stream().map(name -> name.toUpperCase()).forEach(name -> System.out.print(name + " "));

}

From source file:Main.java

public static void main(String[] argv) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7);

    System.out//www  .jav  a  2s.  c  o m
            .println(numbers.stream().map(number -> String.valueOf(number)).collect(Collectors.joining(", ")));
}

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 w w  w . j a  va2  s  . co m*/
}