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AP Computer Science A Videos 108 videos

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AP Computer Science 1.1 Classes and Objects 468 Views


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Description:

AP Computer Science: Classes and Objects Drill 1, Problem 1. Which of the following is a correct {/* Implementation */} for the isInsect method?


Transcript

00:00

Sorry And here's your shmoop du jour brought to you

00:05

by arbitrary visual aids doesn't matter what they are A

00:08

cz long as they help you learn right Yeah well

00:11

given the following code stuff right here Which of the

00:25

following is a correct implementation Or the is insect method

00:31

With our meaning Whether it's insect Art and hear the

00:39

potential answers brought to you by the roman army Here

00:44

we go Okay well here we're being asked that correct

00:46

implementation of a method called is insect which is working

00:49

with an animal object and we're being given three different

00:52

potential ways to go about it It looks like the

00:55

ultimate goal is to grab the data from number of

00:58

legs represented here by delicious burger and determine whether or

01:02

not number of legs is greater than or equal to

01:05

six Right trick though is doing it properly Number of

01:10

legs lived right here in the animal class It's a

01:14

private imager So the rest of the program outside the

01:16

class won't be able to access the variable directly But

01:20

there's also a public access or method called get number

01:23

of legs that can fetch a number of legs for

01:26

us Well we'll need to use it to get it

01:28

Our sweet sweet data let's Take a look at implementation

01:31

one if number of legs is greater than or equal

01:34

to six return true else returned false well for starters

01:38

it trying to access number of leg isn't declared in

01:41

the scope of this function We need access number of

01:44

legs through the object A then even if that had

01:48

worked it's being a bit redundant with this return True

01:50

returned false business have given condition is true return True

01:54

Yeah no kidding but there's a better way Implementation to

01:58

is a little closer to what we want now It

02:00

specifies that number of legs his heart of objects but

02:03

it's still trying to directly access number of legs which

02:06

is a private variable so we need to use the

02:08

access or method implementation three is way better Not only

02:12

does it specify object a but it also calls the

02:14

animal class access or method get number of legs compares

02:18

the data to the number six and returns a true

02:20

or false statement All in one go implementation Three is

02:23

the only one that works with corresponds to cancer See 00:02:29.18 --> [endTime] that's our key to flavor country

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