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Start your free trialAlbert González
22,953 PointsI don't understand it
How can I set the new title?
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;
}
}
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;
}
}
import com.example.model.Course;
import com.example.model.Video;
import java.util.HashMap;
import java.util.Map;
public class QuickFix {
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);
}
public void fixVideoTitle(Course course, String oldTitle, String newTitle) {
videosByTitle(course);
video.setTitle = newTitle;
}
public Map<String, Video> videosByTitle(Course course) {
Map<String, Video> map = new HashMap<>();
for (Video video : course.getVideos()) {
map.put(video.getTitle(), video);
}
return map;
}
}
1 Answer
Albert González
22,953 PointsI don't understand and how to use Keyset inside the for loop.
public void fixVideoTitle(Course course, String oldTitle, String newTitle) {
Map<String, Video> map = new HashMap<>();
for(Video video : videosByTitle(course)) {
}
}
Bryan Gilbert
17,104 PointsBryan Gilbert
17,104 PointsAlbert, try creating a new hash map in the fixVideoTitle() function and populate it with the videosByTitle(course) method. After that, find a way to loop through all of the keys in that new hash map you created (hint: keySet() function). If the oldTitle is found in the key set, set the new title of the video (hint: see the Videos.java file for a function to do this). Let me know if this makes sense.
The HashMap java documentation will be really helpful for you to look at here: https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html