Java Java Data Structures Efficiency! Changing Course

Damjan Vlaic
Damjan Vlaic
19,241 Points

---JAVA---

Can someone help me fix this addForgottenVideo method. The task says:

Can you please help me with the functions in the QuickFix.java over the next few tasks? I've included other code files for your reference only. I'm going to pass in this course to the addForgottenVideo method. For this task, can you please follow the TODOs in the comments in the method?

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"

    // 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

Yanuar Prakoso
Yanuar Prakoso
14,815 Points

Hi Damjan

Basically you just need to follow the TODOs for the first task of the challenge: (I add some points to be noted)

import com.example.model.Course;
import com.example.model.Video;

import java.util.Map;

public class QuickFix {

  public void addForgottenVideo(Course course) {//<-- the method already passed Course type object called course
 // TODO(1):  Create a new video called "The Beginning Bits"
    Video video = new Video("The Beginning Bits");//<-- instantiate new Video Class object let us called it video
                                              //Do not forget to pass the title "The Beginning Bits" when you instantiate it

    // TODO(2):  Add the newly created video to the course videos as the second video.
    course.getVideos().add(1, video);//<--First we call course.getVideos() method which return a List of Videos
    //Then we add the newly created video as second video meaning it will had index as 1 !! 
   //remember in Java indexing always starts from 0. Thus we use a List method of: .add(int index, element)
  //Therefore it is course.getVideos().add(1, video);
  }

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

  }

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

}

I hope this can help a little

Damjan Vlaic
Damjan Vlaic
19,241 Points

tnx for helping, I understand it now