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Java Java Data Structures - Retired Efficiency! Changing Course

Justin Kraft
Justin Kraft
26,327 Points
Posted by Justin Kraft
Justin Kraft
26,327 Points

Last Code Challenge of Java Data Structures - Worked in a different IDK but not here.

I cannot seem to pass this part of the challenge. I copied my code from each class to Eclipse and ran a dummy test to see if I could add a video and change the title and with the code below, it worked. Unfortunately, it does not work here and I cannot locate the issue. Thanks in advance.

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

import java.util.List;
import java.util.HashMap;
import java.util.Map;

public class QuickFix {
      private static Map<String, Video> videoMap = new HashMap<String, Video>();

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

      public void fixVideoTitle(Course course, String oldTitle, String newTitle) {
        Map<String, Video> videos = videosByTitle(course);

        Video videoValue = videos.get(oldTitle);
        videoValue.setTitle(newTitle);

      }

      public Map<String, Video> videosByTitle(Course course) {
        List<Video> vids = course.getVideos();
        for (Video vid : vids) {
          videoMap.put(vid.getTitle(), vid);
        }
        return videoMap;
      }

    }

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,426 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,426 Points

I made the following changes to your code to get it to pass:

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

import java.util.List;
import java.util.HashMap;
import java.util.Map;

public class QuickFix {
      // remove class field. Make it local to videosByTitle
      // private static Map<String, Video> videoMap = new HashMap<String, Video>();

      public void addForgottenVideo(Course course) {
        // TODO(1):  Create a new video called "The Beginning Bits"
        Video newVid = new Video("The Beginning Bits");
        // TODO(2):  Add the newly created video to the course videos as the second video.
        // No '.setVideos()' method exists in challenge
        // Get list of current videos from course
        List<Video> currentVideos = course.getVideos();
        // Add newVid to this list
        currentVideos.add(1, newVid);
      }

      public void fixVideoTitle(Course course, String oldTitle, String newTitle) {
        Map<String, Video> videos = videosByTitle(course);

        Video videoValue = videos.get(oldTitle);
        videoValue.setTitle(newTitle);

      }

      public Map<String, Video> videosByTitle(Course course) {
        // Create local video by title Map
        Map<String, Video> videoMap = new HashMap<String, Video>();
        List<Video> vids = course.getVideos();
        for (Video vid : vids) {
          videoMap.put(vid.getTitle(), vid);
        }
        return videoMap;
      }

    }
patateskafa
patateskafa
7,876 Points
patateskafa
patateskafa
7,876 Points 
 public void fixVideoTitle(Course course, String oldTitle, String newTitle) {
        videosByTitle(course).get(oldTitle).setTitle(newTitle);
      }

this one line also works. you use the previously created videosByTitle method, pass in a course object which returns you a HashMap, you use the get() method and pass in the oldTitle which is the "key" of the map and it returns you the "value" pair of the key (which is a Video object) and then you call the setTitle() method defined in the Video class and pass in the newTitle.