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package com.mycompany.app9;

import java.util.function.Predicate;
import java.util.stream.Stream;

public class Main2 {

    public static boolean testCondition(String t) {
       return t.startsWith("F");
    }
    //
    public static void main(String[] args) {
        //
        Stream<String> s5 = Stream.of("ONE", "TWO", "THREE", "FOUR");
        // кол-во элементов потока
        long count =  s5.count();
        System.out.println("count=" + count);
        // skip - пропуск n элементов
        System.out.println("skip:");
        Stream.of("ONE", "TWO", "THREE", "FOUR").skip(2).forEach(System.out::println);
        // limit - выборка n элементов
        System.out.println("limit:");
        Stream.of("ONE", "TWO", "THREE", "FOUR").limit(1).limit(3).forEach(System.out::println);
        // метод filter
        System.out.println("метод filter:");
        Stream.of("ONE", "TWO", "THREE", "FOUR").filter(s -> s.startsWith("O")).forEach(System.out::println);
        //
        Predicate<String> p1 = s -> s.startsWith("O");
        Predicate<String> p2 = new MyCheck();
        //
        System.out.println("метод filter2:");
        Stream.of("ONE", "TWO", "THREE", "FOUR").filter(p2).forEach(System.out::println);
        // ссылка на метод - используем оператор ::
        System.out.println("метод filter3:");
        // Main2::testCondition - ссылка на статический метод testCondition
        Stream.of("ONE", "TWO", "THREE", "FOUR").filter(Main2::testCondition).forEach(System.out::println);


    }
}