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5 Cards in this Set
- Front
- Back
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If a class contains at least one abstract method, it must be declared as a(n) _________ class.
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abstract
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Classes from which objects can be instantiated are called _________ classes.
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concrete
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_________ involves using a base class variable to invoke methods on base class and derived class objects, enabling you to “program in the general.”
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Polyymorphism
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Methods in a class that do not provide implementations must be declared using keyword _________ .
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abstract
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Casting a reference stored in a base class variable to a derived class type is called _________ .
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downcasting
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