Main.java - master - AnatoliyMatveev/DZ-StreamAPI2

Main.java
48 строк2 KB
AnatoliyMatveev
Create: Education.java, Main.java, Person.java, Sex.java
11 июл 2026, 05:01
11 июл 2026, 05:015677216
import java.util.*;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {

        List<String> names = Arrays.asList("Jack", "Connor", "Harry", "George", "Samuel", "John");
        List<String> families = Arrays.asList("Evans", "Young", "Harris", "Wilson", "Davies", "Adamson", "Brown");
        Collection<Person> persons = new ArrayList<>();
        Random random = new Random();
        for (int i = 0; i < 10_000_000; i++) {
            persons.add(new Person(
                    names.get(new Random().nextInt(names.size())),
                    families.get(new Random().nextInt(families.size())),
                    new Random().nextInt(100),
                    Sex.values()[new Random().nextInt(Sex.values().length)],
                    Education.values()[new Random().nextInt(Education.values().length)])
            );
        }
        //1
        long сhildren = persons.stream()
                .filter(person -> person.getAge() < 18)
                .count();
        System.out.println("Количество не совершеннолетних: " + сhildren);

        //2
        List<String> Army = persons.stream()
                .filter(person -> person.getSex() == Sex.MAN)
                .filter(person -> person.getAge() >= 18 && person.getAge() <= 27)
                .map(Person::getFamily)
                .collect(Collectors.toList());
        System.out.println("Колличество призывников: " + Army.size());

        //3
        List<Person> WorkPeople = persons.stream()
                .filter(person -> person.getEducation() == Education.HIGHER)
                .filter(person -> person.getAge() >= 18)
                .filter(person -> (person.getSex() == Sex.WOMAN && person.getAge() <60)
                        || (person.getSex() == Sex.MAN && person.getAge() <= 65))
                .sorted(Comparator.comparing(Person::getFamily))
                .collect(Collectors.toList());
        System.out.println("Количество работоспособных с высшим образованием: " + WorkPeople.size());



    }
}