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You can, in principle, write more than one class instance into a file, but
then, to read such a file, your program must know how many class instances
have been written, because there is no direct way to test an
ObjectInputStream instance to determine whether all instances have been
read.
Thus, you could use writeObject to store a collection of
Movie instances; however, to read those instances using
readObject, your program either would have to know how many movies have
been written or else make use of the exception throwing done by readObject
when it tries to read past the end of a file.
Evidently, the designers of Java believe that, if you have a collection of instances to store, you should store it as a collection, rather than store each element of the collection individually.