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AP Computer Science A
Unit 9 – Inheritance in Object-Oriented Programming
Topic 9.5
If the class Bird is a superclass of the class Penguin, what happens when Java tries to run the line “Penguin penguin = new Bird();”?
The reference variable `penguin` will point to null.
There will be a compile-time error.
The Bird object will be successfully assigned to the reference variable `penguin` of type Penguin.
Java will change the reference variable `penguin` from type Penguin to type Bird and then assign the Bird object successfully to it.
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AP Computer Science A - 9.5 Creating References Using Inheritance Hierarchies
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Superclass
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Penguin
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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
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