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Whenever you create an array of class instances,
all the elements in the array are
initialized
to a value that represents the absence of an instance. That value is
denoted as null. Thus, if you want a program to determine
whether it has written into an array of instances at a particular place,
you compare the value obtained from that place with null. If the
value obtained from a place is null, you have yet to write an
instance into that place:
movies[counter] == null