Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures - Retired Efficiency! Changing Course

Sara Worth
Sara Worth
5,225 Points

I don't know how to add the new video to the list of course videos

I think I created the new video "The Beginning Bits" correctly but I'm not sure how to add it to the list of course videos.

com/example/model/Course.java
package com.example.model;

import java.util.List;

public class Course {
  private String mName;
  private List<Video> mVideos; 

  public Course(String name, List<Video> videos) {
    mName = name;
    mVideos = videos;
  }

  public String getName() {
    return mName;
  }

  public List<Video> getVideos() {
    return mVideos;
  }

}
com/example/model/Video.java
package com.example.model;

public class Video {
  private String mTitle;

  public Video(String title) {
    mTitle = title;
  }

  public String getTitle() {
    return mTitle;
  }

  public void setTitle(String title) {
    mTitle = title;
  }

}
QuickFix.java
import com.example.model.Course;
import com.example.model.Video;

import java.util.Map;

public class QuickFix {

  public void addForgottenVideo(Course course) {
    // TODO(1):  Create a new video called "The Beginning Bits"
    Video theBeginningBits = new Video("The Beginning Bits");



    // TODO(2):  Add the newly created video to the course videos as the second video.

  }

  public void fixVideoTitle(Course course, String oldTitle, String newTitle) {

  }

  public Map<String, Video> videosByTitle(Course course) {
    return null;
  }

}

2 Answers

Bummer! Looks like you didn't 'add' the new video to the List

They clearly want you to use the '.add' method. We can't just do this on 'course', we have to do it on a list of videos. Thankfully they gave us a method in Course.java to get that list.

  public List<Video> getVideos() {
    return mVideos;
  }

Now it is just a matter of adding it to the second position.

course.getVideos().add(1, theBeginningBits); //<-------add your video object to the position 1

Here is your final code

  public void addForgottenVideo(Course course) {
    // TODO(1):  Create a new video called "The Beginning Bits"
    Video theBeginningBits = new Video("The Beginning Bits");

    // TODO(2):  Add the newly created video to the course videos as the second video.
    course.getVideos().add(1, theBeginningBits);
  }
Sara Worth
Sara Worth
5,225 Points

thank you that worked! :)

Hello

Please try this, mind to screen, not tested ... but give it a try:

    // TODO(2):  Add the newly created video to the course videos as the second video.
    course.getVideos().add(theBeginningBits);

if this answers your question, please mark the question as answered.