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AP Computer Science Videos 113 videos
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AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?
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?
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
Full Transcript
- 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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