Практика4.1

package com.company;

public class Main {

    public interface Printable {
        public void print();
    }

    public static class Book implements Printable {
        public void print() {
            System.out.println("Книга");
        }
        public static void printBooks(Printable[] printable) {
            for (int i=0; i<5; i++) {
                if (printable[i] instanceof Book) System.out.println("Только книги");
            }
        }
    }

    public static class Magazine implements Printable {
        public void print() {
            System.out.println("Журнал");
        }
        public static void printMagazines(Printable[] printable) {
            for (int i=0; i<5; i++) {
                if (printable[i] instanceof Magazine) System.out.println("Только журналы");
            }
        }
    }

    public static void main(String[] args) {
        Book PrestuplenieNakazanie = new Book();
        Book ForWhomTheBellTools = new Book();
        Book Steppenwolf = new Book();
        Magazine NationalGeographic = new Magazine();
        Magazine People = new Magazine();
        Printable[] Paper = new Printable[] {PrestuplenieNakazanie,
                ForWhomTheBellTools, Steppenwolf, NationalGeographic, People};
        for (int i=0; i<5; i++) {
            Paper[i].print();
        }
        System.out.println();
        Book.printBooks(Paper);
        System.out.println();
        Magazine.printMagazines(Paper);
    }
}