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AP Computer Science Videos 112 videos

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AP Computer Science 2.5 Classes and Objects 178 Views


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Description:

AP Computer Science 2.5 Classes and Objects. Which of the following is not a legal method of call?

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Transcript

00:00

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

00:05

you by crackpot marketing schemes Whether you need a comically

00:09

huge pencil emblazoned with your logo or branded toilet seat

00:12

covers let a crackpot marketing scheme change the way you

00:15

do business I don't know I consider the following declaration

00:20

Find a people's find o b equals folksy Which of

00:25

the following is not a legal method of cough One

00:29

eight hundred No Okay here we go And here the

00:31

potential answers and roman new rose grows older Walked into

00:36

a bar in order to five years Okay here we

00:39

go All right Sounds like we're being asked which of

00:42

the given method calls are invalid But what on earth

00:46

are method calls And when will you ever use them

00:48

Are typically a large job project will be split into

00:51

separate classes To make code more manageable you might have

00:55

one class handling the saving and loading of files Another

00:58

class handling networking a class handling graphics and someone that

01:03

way When there's a bug in a certain function or

01:05

the code needs to be modified All the relevant codes

01:08

in one place makes sense right Well the main class

01:11

Will then call various methods from other classes as needed

01:16

Okay so small programming project may not need so many

01:19

separate classes but if things get more complicated well it

01:22

helps agree field i think about how a small company

01:25

might be just one or two people handling everything in

01:27

a garage Well that's perfectly manageable because it's a relatively

01:30

small operation with a little work to do but a

01:33

large company of dozens or hundreds of people would have

01:36

to be split into departments each with different test And

01:39

when it's time to do something with same marketing well

01:41

you'd have to give him a call Yes hello marketing

01:44

department We need to get our name out there and

01:47

i'm thinking pigeon sweaters Ooh well well put thousands of

01:51

tiny sweaters on pigeons all over the city with a

01:53

branding calling elsewhere to make a request is the same

01:57

thing we're doing with method calls just with fewer pigeons

02:00

Sweater anyhow let's look at our options and figure out

02:03

which your invalid option one tries to call of meth

02:05

that would object c but see is just a noel

02:09

object and hasn't been specified as a new anything option

02:12

One won't work at all Option two tries to call

02:15

the shed leaves method with object b which looks like

02:18

it's gonna work Object b is in book object and

02:21

the shed leaves method resides within the low class looking

02:24

good options Option three tries to call the shed leaves

02:27

method Thanks but object is a pine object with behind

02:31

Class doesn't contain a shed leaves method It's only got

02:34

shed needles Option three is not going to cut it

02:37

That makes our answer D because i'm on one and 00:02:39.42 --> [endTime] three are talent and so are pigeons

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