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Java Java Data Structures - Retired Efficiency! Changing Course

Schwartz Prince
PLUS
Schwartz Prince
Courses Plus Student 2,132 Points
Posted by Schwartz Prince
Schwartz Prince
Courses Plus Student 2,132 Points

Need Help

Couldn't get the answer. Please help.

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.List;
import java.util.Map;

import java.util.Map;

public class QuickFix {

  public void addForgottenVideo(Course course) {

    List<Video> videoList = course.getVideos(); 
  Video vd = new Video("The Beginning Bits");
    videoList.add(1,vd);
    // 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) {
    videoMap.put(video.getTitle(), videoList.get(1));
    return null;
  }

}

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi there,

I did took a similar line to you. First, declare a new Video instance with the provided title.

Next, use the course passed in as a parameter and get the List it contains using getVideos(). I then chained the add method straight onto that, passing in the same parameters as you did, (1, video). This seems to pass the task OK: 

  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);
  }

I hope that helps,

Steve.