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Java Java Data Structures - Retired Efficiency! Changing Course

Posted by Nirbhay Agarwal
Nirbhay Agarwal
2,852 Points

I am not able to complete this challenge!

Can someone review it please

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;
import java.util.*;


public class QuickFix {

  public void addForgottenVideo(Course course) {
   List<Video> videoList = course.getVideos();
    Video video = new Video("The Beginning Bits");
    videoList.add(1, video);  
   }

    // TODO(1):  Create a new video called "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;
  }

}

1 Answer

Semen Zadorozhnyi
Semen Zadorozhnyi
8,515 Points
Semen Zadorozhnyi
Semen Zadorozhnyi
8,515 Points 
<p> 
public void addForgottenVideo(Course course) {
    List<Video> videoList = course.getVideos();
    Video video = new Video("The Beginning Bits");
    videoList.add(1, video);  
   } 
</p>

So.. what they trying to get from you: changed Course object where second item is your new Video

What you actually do: create new List<Video> add put new Video inside

At the same time your Course object have zero changes

That's how it should look:

<p>
public void addForgottenVideo(Course course) {
    // TODO(1):  Create a new video called "The Beginning Bits"
    Video video = new Video("The Beginning Bits");
    // TODO(2):  Add the newly created video to the course videos as the second video.
    course.getVideos().add(1,video);
  }
</p>

Best of luck