Thread: ObjectInputStream

This warning: Type safety: Unchecked cast from Object to ArrayList<Media>

Okay, i changed some stuff around and i think that this should work, but it doesn't work.

	public void readFromFile() {
		  try {  
			  ObjectInputStream inStream = new ObjectInputStream(new FileInputStream("object.txt"));
		   try {
		    ArrayList<Media> mediaList = (ArrayList<Media>) inStream.readObject(); 
		    } catch (EOFException exc) {
 
		    }
		    inStream.close();
		  } catch(Exception ex) {
		   ex.printStackTrace();
		  }
		}

Couldn't get it to work so i went with another method.

	public void saveOnFile() {
		File file = new File("data.txt");
 
		try {
			if(!file.createNewFile()) {
				file.createNewFile();
			}
			FileWriter out = new FileWriter(file.getAbsoluteFile());
			BufferedWriter bW=new BufferedWriter(out);
 
			bW.write(this.mediaList.size() + "\r\n");
			for(int i = 0; i < mediaList.size(); i++) {
				 bW.write(this.mediaList.get(i).toString());
			}
			bW.close();
		} catch(IOException e) {
			e.printStackTrace();
		}
	}
 
	public void readFromFile() {
		FileReader fileReider;
		try {
			fileReider = new FileReader("data.txt");
			BufferedReader bufferedReader = new BufferedReader(fileReider);
			int tempSize = Integer.parseInt(bufferedReader.readLine());
 
			for(int i = 0; i < tempSize; i++) {
				// Get items from file
				String title = bufferedReader.readLine();
				Double playTime = Double.parseDouble(bufferedReader.readLine());
				int year = Integer.parseInt(bufferedReader.readLine());
				bufferedReader.readLine();
				String directory = bufferedReader.readLine();
				String mediaPath = bufferedReader.readLine();
				String imagePath = bufferedReader.readLine();
				bufferedReader.readLine();
				int objectTypeValue = Integer.parseInt(bufferedReader.readLine());
 
				if(objectTypeValue == 0) { // If Movie add movie else add a TV-show
					String quality = bufferedReader.readLine();
					boolean subtitles = Boolean.parseBoolean(bufferedReader.readLine());
					String language = bufferedReader.readLine();
					String writer = bufferedReader.readLine();
 
					addMovie(title, playTime, year, directory, mediaPath, imagePath, quality, subtitles, language, writer);
				} else {
					int season = Integer.parseInt(bufferedReader.readLine());
					int episode = Integer.parseInt(bufferedReader.readLine());
 
					addTVShow(title, playTime, year, directory, mediaPath, imagePath, season, episode);
				}
			}
			bufferedReader.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

This is the way i learned to do it in c++ thought it would be nice to know how ObjectInput-/output-Stream works as well.

Neither do i. I was looking at another thread there someone had similar problems. They ended up changing the ArrayList to List

  List<Media> mediaList = (List<Media>) inStream.readObject();

but he only had one type of element and i have two. But the way i did it know is easier to understand because i can see every step in the function because i made it myself. I find that thats a problem with "premade" methods "it's hard to get an understanding of what's actually happening".