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AP Computer Science A Videos 108 videos
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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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