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Java

Posted by James Han
James Han
9,419 Points

Cannot figure out why I get an error: "for-each not applicable to expression type".

I searched up examples and they show:

public void createFile(String... fn) {
    for (String f : fn) {
        ...

So I expected this to work:

public Map<String, Video> videosByTitle(Course course) {
    Map<String, Video> videoMap = new HashMap<>();
    List<Video> videoList = course.getVideos();
    for (Course c : course) {
        System.out.println("%s", c.getName()); 
    }/*
    for (Video video : videoList) {
      System.out.printf("%s - %s%n", course.getName(), video.getTitle());
        videoMap.put(course.getName(), video);
    }*/
    return videoMap;
  }

Can someone give me some tips and/or explanations that may not be clear to me? Thanks~

1 Answer

AFJNIK hassan
AFJNIK hassan
11,416 Points
AFJNIK hassan
AFJNIK hassan
11,416 Points

hi you try to get name with course's method , but what is expected is the title of video witch is in video class

public Map<String, Video> videosByTitle(Course course) {

  Map<String, Video> videoMap = new HashMap<String, Video>();
  List<Video> videoList = course.getVideos();

  for (Video v : videoList) {
    videoMap.put(v.getTitle(), v);
  }

  return videoMap
}