package part2streams;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.Comparator;

import java.util.List;

import java.util.Optional;

import java.util.stream.Stream;

public class CollectorsExample {

public static void main(String[] args) throws IOException {

List<Person> persons = new ArrayList<>();

try (BufferedReader reader = new BufferedReader(

new InputStreamReader(CollectorsExample.class.getResourceAsStream("persons.txt")))) {

Stream<String> lines = reader.lines();

lines.map(line -> {

String[] a = line.split(" ");

Person p = new Person(a[0].trim(), Integer.valueOf(a[1]));

persons.add(p);

return p;

}).forEach(System.out::println);

}

System.out.println("________");

Stream<Person> stream = persons.stream();

stream.filter(p -> p.getAge() > 20).forEach(System.out::println);

System.out.println("________");

stream = persons.stream();

Optional<Person> min = stream.filter(p -> p.getAge() > 20).min(Comparator.comparing(Person::getAge));

System.out.println(min);

System.out.println("________");

}

}