Example usage for java.util.stream Collectors averagingInt

Introduction

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

Prototype

public static <T> Collector<T, ?, Double> averagingInt(ToIntFunction<? super T> mapper) 

Source Link

Document

Returns a Collector that produces the arithmetic mean of an integer-valued function applied to the input elements.

Usage

From source file:Main.java

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

    double o = s.collect(Collectors.averagingInt(n -> Integer.parseInt(n)));

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

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From source file:Main.java

public static void main(String... args) {
    double o = Food.menu.stream().collect(Collectors.averagingInt(Food::getCalories));
    System.out.println(o);//w  w  w  .j a va2s. c  o  m

}

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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));

    Double averageAge = persons.stream().collect(Collectors.averagingInt(p -> p.age));

    System.out.println(averageAge); // 19.0
}

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