Example usage for java.util List stream

List of usage examples for java.util List stream

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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) {
    Student raoul = new Student("Raoul", "Cambridge");
    Student mario = new Student("Mario", "Milan");
    Student alan = new Student("Alan", "Cambridge");
    Student brian = new Student("Brian", "Cambridge");

    List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
            new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
            new Graduate(alan, 2012, 950));

    int highestValue = transactions.stream().map(Graduate::getValue).reduce(0, Integer::max);
    System.out.println(highestValue);

}

From source file:Main.java

public static void main(String... args) {
    Student raoul = new Student("Raoul", "Cambridge");
    Student mario = new Student("Mario", "Milan");
    Student alan = new Student("Alan", "Cambridge");
    Student brian = new Student("Brian", "Cambridge");

    List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
            new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
            new Graduate(alan, 2012, 950));

    String traderStr = transactions.stream().map(transaction -> transaction.getTrader().getName()).distinct()
            .sorted().reduce("", (n1, n2) -> n1 + n2);
    System.out.println(traderStr);

}

From source file:Main.java

public static void main(String... args) {
    Student raoul = new Student("Raoul", "Cambridge");
    Student mario = new Student("Mario", "Milan");
    Student alan = new Student("Alan", "Cambridge");
    Student brian = new Student("Brian", "Cambridge");

    List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
            new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
            new Graduate(alan, 2012, 950));

    boolean milanBased = transactions.stream()
            .anyMatch(transaction -> transaction.getTrader().getCity().equals("Milan"));
    System.out.println(milanBased);

}

From source file:Main.java

public static void main(String... args) {
    Student raoul = new Student("Raoul", "Cambridge");
    Student mario = new Student("Mario", "Milan");
    Student alan = new Student("Alan", "Cambridge");
    Student brian = new Student("Brian", "Cambridge");

    List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
            new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
            new Graduate(alan, 2012, 950));

    List<String> cities = transactions.stream().map(transaction -> transaction.getTrader().getCity()).distinct()
            .collect(Collectors.toList());
    System.out.println(cities);//  w  ww .j a  v  a2s.c om

}

From source file:Main.java

public static void main(String... args) {
    Student raoul = new Student("Raoul", "Cambridge");
    Student mario = new Student("Mario", "Milan");
    Student alan = new Student("Alan", "Cambridge");
    Student brian = new Student("Brian", "Cambridge");

    List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
            new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
            new Graduate(alan, 2012, 950));

    List<Graduate> tr2011 = transactions.stream().filter(transaction -> transaction.getYear() == 2011)
            .sorted(Comparator.comparing(Graduate::getValue)).collect(Collectors.toList());
    System.out.println(tr2011);/*from  w ww. ja  v  a 2  s . c om*/

}

From source file:Main.java

public static void main(final String[] args) {
    List<String> stringCollection = new ArrayList<>();
    stringCollection.add("ddd2");
    stringCollection.add("aaa2");
    stringCollection.add("bbb1");
    stringCollection.add("aaa1");
    stringCollection.add("bbb3");
    stringCollection.add("ccc");
    stringCollection.add("bbb2");
    stringCollection.add("ddd1");

    stringCollection.stream().sorted().filter((s) -> s.startsWith("a")).forEach(System.out::println);
}

From source file:Main.java

public static void main(final String[] args) {
    List<String> stringCollection = new ArrayList<>();
    stringCollection.add("ddd2");
    stringCollection.add("aaa2");
    stringCollection.add("bbb1");
    stringCollection.add("aaa1");
    stringCollection.add("bbb3");
    stringCollection.add("ccc");
    stringCollection.add("bbb2");
    stringCollection.add("ddd1");

    stringCollection.stream().map(String::toUpperCase).sorted((a, b) -> b.compareTo(a))
            .forEach(System.out::println);
}

From source file:Main.java

public static void main(final String[] args) {
    List<String> stringCollection = new ArrayList<>();
    stringCollection.add("ddd2");
    stringCollection.add("aaa2");
    stringCollection.add("bbb1");
    stringCollection.add("aaa1");
    stringCollection.add("bbb3");
    stringCollection.add("ccc");
    stringCollection.add("bbb2");
    stringCollection.add("ddd1");

    long startsWithB = stringCollection.stream().filter((s) -> s.startsWith("b")).count();

    System.out.println(startsWithB); // 3

}

From source file:Main.java

public static void main(final String[] args) {
    List<String> stringCollection = new ArrayList<>();
    stringCollection.add("ddd2");
    stringCollection.add("aaa2");
    stringCollection.add("bbb1");
    stringCollection.add("aaa1");
    stringCollection.add("bbb3");
    stringCollection.add("ccc");
    stringCollection.add("bbb2");
    stringCollection.add("ddd1");

    // filtering/* w ww .j  av  a 2  s  .c  o  m*/

    stringCollection.stream().filter((s) -> s.startsWith("a")).forEach(System.out::println);
}

From source file:Main.java

public static void main(final String[] args) {
    List<String> stringCollection = new ArrayList<>();
    stringCollection.add("ddd2");
    stringCollection.add("aaa2");
    stringCollection.add("bbb1");
    stringCollection.add("aaa1");
    stringCollection.add("bbb3");
    stringCollection.add("ccc");
    stringCollection.add("bbb2");
    stringCollection.add("ddd1");

    boolean anyStartsWithA = stringCollection.stream().anyMatch((s) -> s.startsWith("a"));

    System.out.println(anyStartsWithA); // true
}