Playlist Application 🎧

I created a playlist application in Java that supports adding, deleting, and navigating through different podcast episodes. In order to make navigating through the playlist flexible, it made the most sense to use a circular doubly linked list. Through this assignment I was able to deepen my understanding of linked lists and apply the knowledge that I had learned in class.

Classes

• Episode: Essentially a node where it contains title, length, next episode, and prev episode.
• Playlist: This is the circular doubly linked list that contains a list of Episode objects. The playlist will always keep track of the head or the first episode in the list size or the total number of episodes
• ITunes: This represents the application where you can test the functionality of the playlist and look at the episode.

Usage

Instructions

Download all files, ITunes.java is where you add episodes, create the playlist, and use all the functions listed below.

Available Functions

public class Playlist {
  public String displayPlaylistForward()
  public String displayPlaylistBackward()
  public void addFirst(String title, double length)
  public void add(String title, double length, int index)
  public Episode deleteFirst()
  public Episode deleteLast()
  public Episode deleteEpisode(String title)
  
  // Remove (delete) every m-th Episode in the user's circular Playlist,
	// until only one Episode survives. Return the survived Episode.
  public Episode deleteEveryMthEpisode(int m)
}

Demo

public class ITunes {
    // create playlist object
		Playlist pl = new Playlist();
		
    // populate playlist
		pl.addLast("PlanetMoney",26.0);
		pl.addLast("HowIBuiltThis",10);
		pl.addLast("EzraKleinShow",65.0);
		pl.addLast("RadioLab",25.5);
		pl.addLast("MakeMeSmart",24.5);
		pl.addLast("Worldly",55);

    // functions
		System.out.println("Forward: " + pl.displayPlaylistForward());
    // remove every nth episode in a loop until one episode remains
		System.out.println("Last Episode Remaining:" + pl.deleteEveryMthEpisode(3));
}

Forward: [BEGIN] (3|3.0MIN) -> (2|3.0MIN) -> (1|3.0MIN) -> (0|3.0MIN) [END]

Last Episode Remaining:[BEGIN] (3|3.0MIN) [END]