Example usage for java.util.stream Collectors summarizingInt

Introduction

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

Prototype

public static <T> Collector<T, ?, IntSummaryStatistics> summarizingInt(ToIntFunction<? super T> mapper) 

Source Link

Document

Returns a Collector which applies an int -producing mapping function to each input element, and returns summary statistics for the resulting values.

Usage

From source file:Main.java

public static void main(String[] args) {
    IntSummaryStatistics incomeStats = Employee.persons().stream()
            .collect(Collectors.summarizingInt(Employee::getIncome));
    System.out.println(incomeStats);
}

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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));

    IntSummaryStatistics ageSummary = persons.stream().collect(Collectors.summarizingInt(p -> p.age));

    System.out.println(ageSummary);
}

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