Example usage for java.util.stream Collectors counting

Introduction

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

Prototype

public static <T> Collector<T, ?, Long> counting() 

Source Link

Document

Returns a Collector accepting elements of type T that counts the number of input elements.

Usage

From source file:Main.java

public static void main(String[] args) {
    System.out.println("counting " + Arrays.asList(1, 20, 40, 4).stream().collect(Collectors.counting()));
}

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From source file:Main.java

public static void main(String[] args) {
    Stream<String> s = Stream.of("1", "2", "3");

    long o = s.collect(Collectors.counting());

    System.out.println(o);//from   w w  w.ja  v  a  2 s .  c  om

}

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From source file:Main.java

public static void main(String... args) {
    long o = Food.menu.stream().collect(Collectors.counting());
    System.out.println(o);

}

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From source file:Main.java

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

    long m = stringList.stream().collect(Collectors.counting());
    System.out.println(m);//from  w  w w  . j a v a 2  s .  co  m
}

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From source file:Main.java

public static void main(String... args) {
    Map<Type, Long> t = Food.menu.stream().collect(Collectors.groupingBy(Food::getType, Collectors.counting()));

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

}

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From source file:Main.java

public static void main(String[] args) {
    Map<Employee.Gender, Long> countByGender = Employee.persons().stream()
            .collect(Collectors.groupingBy(Employee::getGender, Collectors.counting()));
    System.out.println(countByGender);
}

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From source file:Main.java

public static void main(String[] args) {
    Map<Employee.Gender, Long> countByGender = Employee.persons().stream()
            .collect(Collectors.groupingByConcurrent(Employee::getGender, Collectors.counting()));
    System.out.println(countByGender);
}

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From source file:Main.java

/**
 * Returns a collector that computes the distribution of the provided elements. This effectively counts how many
 * times an item has appeared in a stream.
 *
 * @param <T>//from   w  w w.  j a v  a 2  s .c  o  m
 *            the counted type
 * @return the distribution collector
 */
public static <T> Collector<T, ?, Map<T, Long>> distribution() {
    return Collectors.groupingBy(Function.identity(), Collectors.counting());
}

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From source file:com.firewallid.util.FIUtils.java

public static <L> Map<L, Long> reduceListToMap(List<L> l) {
    Map<L, Long> map = l.parallelStream()
            .collect(Collectors.groupingBy(object -> object, Collectors.counting()));

    return map;/*from  w w  w  . jav a2 s.co m*/
}

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From source file:documents.DocumentProvider.java

public long documentsAvailable() {
    return docsAvailable.entrySet().stream().filter(s -> s.getValue() == 0).collect(Collectors.counting());
}

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