Example usage for java.util.stream Collectors partitioningBy

Introduction

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

Prototype

public static <T, D, A> Collector<T, ?, Map<Boolean, D>> partitioningBy(Predicate<? super T> predicate,
        Collector<? super T, A, D> downstream)

Source Link

Document

Returns a Collector which partitions the input elements according to a Predicate , reduces the values in each partition according to another Collector , and organizes them into a Map whose values are the result of the downstream reduction.

Usage

From source file:Main.java

public static void main(String... args) {
    Map<Boolean, Map<Type, List<Food>>> o = Food.menu.stream()
            .collect(Collectors.partitioningBy(Food::isVegetarian, Collectors.groupingBy(Food::getType)));

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

}

From source file:Main.java

public static void main(String... args) {
    Map<Boolean, Food> o = Food.menu.stream().collect(Collectors.partitioningBy(Food::isVegetarian, Collectors
            .collectingAndThen(Collectors.maxBy(Comparator.comparingInt(Food::getCalories)), Optional::get)));
    System.out.println(o);/*from  ww w  .ja va2 s . c  o m*/

}

From source file:Main.java

public static void main(String[] args) {
    Map<Boolean, String> partionedByMaleGender = Employee.persons().stream().collect(Collectors
            .partitioningBy(Employee::isMale, Collectors.mapping(Employee::getName, Collectors.joining(", "))));
    System.out.println(partionedByMaleGender);
}