Question

Class MediaMerger

This class is meant to host the main method used to test all the other classes in our project.

We reccomend that you work on implementing the main method in this class progressively, as you add features to the other classes of this project. Do not attempt to implement all requirements for the main method before the other classes are able to be used in that manner. Work progressively, as demonstrated during the live coding videos in the lectures.
Start by creating two separate ArrayList objects that will be referenced by the following variables:
• allVideos, referring to a list of objects of class Video
• allBooks, referring to a list of objects of class Book
You will then create 3 objects of class Video and 3 objects of Class Book, representing videos and books of your choice, and add them to their respective list.

When the list have been populated, you will iterate on each list, one after the other, and display what the toString method returns for each object therein
Once you got the above working and therefore added the necessary ode to all classes, proceed with adding a 3rd ArrayList as follows; Declare a reference variable named everything and create a new object of class ArrayList that will allow us to store references of class medium in the new list. As described in the remainder of these requirements, this new class Medium will be the superclass of both the classes Video & Book.

You will then iterate on each of the first two lists you created and add every Video or Book objects they reference to the list by everything.

You will then iterate on the list referenced by everything to display the information about every object that has just been added to it.

the programming language is java

Answer 1

import java.util.ArrayList;

public class MediaMerger {

   public static void main(String[] args) {
       ArrayList<Video> allVideos = new ArrayList<>(); // ArrayList of video class
       ArrayList<Book> allBooks = new ArrayList<>(); // ArrayList of book class
       Video video1 = new Video("7 rings"); // Making the video objects.
       Video video2 = new Video("See you Again");
       Video video3 = new Video("Filhaal");
       allVideos.add(video1); // Adding the video object in the allVideos arraylist.
       allVideos.add(video2);
       allVideos.add(video3);
       Book book1=new Book("In Search of Lost Time"); // Making the book objects.
       Book book2=new Book("Ulysses");
       Book book3=new Book("Don Quixote");
       allBooks.add(book1); // Adding the video object in the allBooks arraylist.
       allBooks.add(book2);
       allBooks.add(book3);
      
       for(int i=0;i<allVideos.size();i++) { // Iterating on allVideos arraylist
           System.out.println(allVideos.get(i).toString()); // Using toString() method.
       }
      
       for(int i=0;i<allBooks.size();i++) { // Iterating on allBooks arraylist
           System.out.println(allBooks.get(i).toString()); // Using toString() method.
       }
      
       ArrayList<Medium> everything=new ArrayList<>(); // Making the arraylist for medium objects
       for(int i=0;i<allVideos.size();i++) { //Iterating on the allVideos arraylist.
           everything.add(allVideos.get(i)); // Adding the allVideos arraylist objects in everything arraylist.
       }
      
       for(int i=0;i<allBooks.size();i++) { //Iterating on the allBooks arraylist.
           everything.add(allBooks.get(i)); // Adding the allBooks arraylist objects in everything arraylist.
       }
      
       for(int i=0;i<everything.size();i++) { //Iterating on the everything arraylist.
           System.out.println(everything.get(i).name);
       }
   }

   private static class Medium { // Medium Class is made
       String name;
       private Medium(String str) { //Parametrized Constructor taking input as String.
           name=str;
       }
   }

   private static class Video extends Medium { // Video class extending Medium class
       String name;
       private Video(String str) { // Parametrized Constructor taking input as String.
           super(str);
           name=str; // Setting name of video as an input String
       }
   }

   private static class Book extends Medium { // Book class extending Medium class
       String name;
       private Book(String str) { // Parametrized Constructor taking input as String.
           super(str);
           name=str; // Setting name of book as an input String
       }
   }

}

Output:-

Console X <terminated> MediaMerger (Java Application] C:\Program Files Vava\jre 1.8.0_221\bin\javaw.exe (Nov 19, 2019, 5:50:01 PM) MediaMerger$Video@7852e922 MediaMerger $Video@4e25154f MediaMerger$Video@7dea4e MediaMerger $Book@5c647 e05 MediaMerger $Book@33909752 MediaMerger $Book@55f96302 7 rings See you Again Filhaal In Search of Lost Time Ulysses Don Quixote