getting exception during deserialization

Question

public List<Show> populateDataFromFile(String fileName)
 {
    List<Show> shows= null;
    try{
        ObjectInputStream in=new ObjectInputStream(new FileInputStream(fileName));
        shows= (List<Show>) in.readObject();
       in.close();

    }
    catch(Exception e)
    {
        e.printStackTrace();
    }


      return shows;

 }

I'm getting java.lang.ClassCastException: com.bean.Show cannot be cast to java.util.List

I've performed deserialization to initialise data of show class that is already serialized. I also make show class as serializable by implementing serializable i/f. I think readObject method can't convert into ArrayList .. Please tell me how do I convert it?

Answer 1

What you've written in the file, must be an instance of the Show class, not a List<Show> . Perhaps, instead of outputStream.writeObject(list); you did something like for(Show show: list) outputStream.writeObject(show); ? Try reading it back the same way:

List<Show> shows = new ArrayList<Show>();
try {
    while(true) {
        shows.add((Show) in.readObject());
} catch (EOFException e) {
   in.close();
   // end of file
}

Answer 2

显然，您已序列化的对象是Show的单个对象，而不是您期望的Show的List，请尝试将其强制转换为Show或检查序列化，并确保您要序列化List<Show> 。