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Description:

AP Computer Science 1.3 Program Development. Which of the following is a correct declaration of one of the classes in the diagram?

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Transcript

00:00

Thank you We sneak and here's your smoke du jour

00:05

Brought to you by inheritance relationships Why yes wealthy old

00:09

lady We'd love to help you paint mr grumbles now

00:12

All right this question is based on the following class

00:14

Higher every diagram no an open air Oh denotes an

00:17

inheritance relationship and a closed arrow to notes a composition

00:22

relationship So which of the following is a correct declaration

00:26

of one of the classes in the diagram Alright we'll

00:30

hear your potential answers Freedom freedom Think All right So

00:33

this question is about inheritance and composition relationship which could

00:37

be more easily thought of as is and has a

00:41

relationship But look at the diagram again Closed down arrows

00:45

show inheritance or is a relationship North american country is

00:49

a country Asian country is a country european Well these

00:55

classes are just more specific versions of the class they're

00:59

inheriting from then we have composition or has a relationship

01:03

represented by the up Arrow state has a north american

01:08

country It belongs to province and territory do too Okay

01:13

So back to the question at hand Which of the

01:15

potential answers is a correct declaration of the goings on

01:18

In a diagram well option a declares north american country

01:21

as an independent class Nice try jefferson but we're not

01:24

talking about the tyranny of king george We need to

01:27

declare north american country as a subclass of country if

01:31

we're following the diagram option b says state extends or

01:35

inherits from country which isn't correct according to the diagram

01:39

In fact it's outright saying that state is a country

01:42

and well known on it all our option c has

01:46

east asian country extends from asian country which is absolutely

01:50

true East asian country is an asian country d says

01:55

territory extends from north american country territory is a north

02:01

american country and e country extends from north american country

02:07

Not even soc is definitely our answer Anyone seen the

02:10

nail polish remover No i

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