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Playlist AP® Computer Science: Inheritance, Abstraction, and Polymorphism 15 videos
AP Computer Science 1.1 Inheritance, Abstraction, and Polymorphism. Which of the following are correct?
APCS: Inheritance, Abstraction, and Polymorphism Drill 1, Problem 2. Which of the following is the correct way to begin writing your class?
AP Computer Science 1.3 Inheritance, Abstraction, and Polymorphism. Which of the following is true?
AP Computer Science 1.4 Inheritance, Abstraction, and Polymorphism 190 Views
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Description:
AP Computer Science 1.4 Inheritance, Abstraction, and Polymorphism. Which of the following code segments will not cause an error?
Transcript
- 00:00
Thank you We sneak And here's your shmoop du jour
- 00:05
brought to you by a degenerate pomegranate He is just
- 00:09
so seedy But consider the following class hierarchy Diagram fruit
- 00:13
berries I assume that every class in the diagram has
- 00:18
a default constructor with no arguments For example default constructor
Full Transcript
- 00:23
for fruit is which of the following code segment will
- 00:27
not cause an error The we can see the choice
- 00:35
is incorrect off bad because swede is not a subclass
- 00:38
of fruit Thus we can't put a seed object into
- 00:41
a fruit object B is also wrong because it attempts
- 00:44
to put a super class into a subclass Remember this
- 00:47
is disallowed job of the compiler old give you an
- 00:50
error and try see tries to put a grape object
- 00:53
into a setlist through legal is great is a subclass
- 00:56
of scene with fruit and it's probably our answer but
- 00:59
let's check the others just to make sure Well george
- 01:01
is incorrect because well again you can't put a super
- 01:03
glass into a subclass Got it finally choice easy easy
- 01:07
to eliminate as well because it doesn't specify the type
- 01:10
of object that he use It hasn't declared with new
- 01:14
variable though choice sees our answer we can see it 00:01:18.171 --> [endTime] very very clearly
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