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Having stored Movie instances in a vector, you might think that you
could calculate the rating of one of those instances, using the
rating method, as follows:
*-- Vector access | | *-- Method call | BUG! v v | Object instance has ---------------- -------- | no rating method v.firstElement().rating() |
The reason such an expression does not work is that the
elements of a
vector always appear to be instances of the Object class, and no
rating method is defined for the Object class.