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Inheritance, Abstraction, and Polymorphism Videos 17 videos

AP Computer Science 1.2 Inheritance, Abstraction, and Polymorphism
369 Views

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 1.1 Inheritance, Abstraction, and Polymorphism
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AP Computer Science 1.1 Inheritance, Abstraction, and Polymorphism. Which of the following are correct?

AP Computer Science 1.3 Inheritance, Abstraction, and Polymorphism
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AP Computer Science 1.3 Inheritance, Abstraction, and Polymorphism. Which of the following is true?

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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?

Language:
English Language

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

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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