Revise paste Untitled

import java.util.Scanner;
public class Zadaca {

public static void main(String[] args) {
        Media b1 = new Book("Zoki Poki", "Olivera", 50);
        Media b2 = new Book("Doktor Ofboli", "Ofboli", 105);
        Media b3 = new Book("ABC", "BCD", 300);

Media m1 = new Movie("Titanik", "Titanik", 2.5);
        Media m2 = new Movie("Movie", "Movie", 3.5);
        Movie m3 = new Movie("XYZ", "XYZ", 15.6);

Media[] medias = new Media[6];
        medias[0] = b1;
        medias[1] = b2;
        medias[2] = b3;

medias[3] = m1;
        medias[4] = m2;
        medias[5] = m3;
        Library library = new Library();
        library.displayAllMedia(medias);
        
    }
    
}

class Media {
    String title;
    String creator;

public Media(String title, String creator) {
        this.title = title;
        this.creator = creator;
    }

public String getTitle() {
        return title;
    }
    public String getCreator() {
        return creator;
    }

public void displayInfo() {
        System.out.println("Title: " + title);
        System.out.println("Creator: " + creator);
    }

}

class Book extends Media {
    int numPages;

public Book(String title, String creator, int numPages) {
        super(title, creator);
        this.numPages = numPages;
    }
    public void readSample() {
        System.out.println("The sample pages are available to read " + numPages);
    }

@Override
    public void displayInfo() {
        super.displayInfo();
        System.out.println("Number of pages: " + numPages);
    }

}

class Movie extends Media {
    double duration;

public Movie(String title, String creator, double duration) {
        super(title, creator);
        this.duration = duration;
    }
    public void watchTrailer() {
        System.out.println("This trailer is available to watch: " + duration);
        
    }

@Override
    public void displayInfo() {
        super.displayInfo();
        System.out.println("Duration: " + duration);
    }
}

class Library {
    public void displayAllMedia(Media[] medias) {
        for(int i = 0; i < medias.length; i++) {
            medias[i].displayInfo();
            if(medias[i] instanceof Book) {
                Book book = (Book) medias[i];
                book.readSample();
            }
            else if(medias[i] instanceof Movie) {
                Movie movie = (Movie) medias[i];
                movie.watchTrailer();
            }
        }

}
}