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);
    numbers.stream().map(n -> n * n).forEach(System.out::println);
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    numbers.stream().filter(n -> n % 2 == 0).forEach(System.out::println);
}

From source file:Main.java

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

    numberList.stream().map(n -> n * 2).forEach(System.out::println);
}

From source file:Main.java

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

    stringList.stream().forEachOrdered(System.out::println);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    // map/*  ww w.  j a  va2  s  .  com*/
    List<String> words = Arrays.asList("Hello", "World");

    words.stream().flatMap((String line) -> Arrays.stream(line.split(""))).distinct()
            .forEach(System.out::println);

}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    int sum = numbers.stream().reduce(0, Integer::sum);
    System.out.println(sum);/*from   w  ww .j  a va2 s . c  o  m*/
}

From source file:Main.java

public static void main(String... args) {
    List<Integer> numbers = Arrays.asList(3, 4, 5, 1, 2);
    int sum = numbers.stream().reduce(0, (a, b) -> a + b);
    System.out.println(sum);//from   w  ww.  ja  va2  s  . c om
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    int i = numbers.stream().filter(n -> n % 2 == 0).findFirst().orElse(-1);

    System.out.println(i);/*w ww.  j  a v a2s  .c om*/
}

From source file:Main.java

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

    System.out.println(o);/*from  ww  w  . j  a  va  2  s . co m*/
}

From source file:Main.java

public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    int sum = numbers.stream().filter(n -> n % 2 == 1).map(n -> n * n).reduce(0, Integer::sum);

    System.out.println(sum);//from ww w .j  a v  a 2  s. co m
}