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AP Computer Science 3.1 Classes and Objects 187 Views
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Description:
In this computer science problem, which of the following should be declared as private?
Transcript
- 00:00
Sorry And here's your shmoop douceur brought to you by
- 00:05
canoe jokes can new jokes or you kidding me Which
- 00:15
of the following should be declared His private song name
- 00:18
gets on name prince We're writing a class called paddling
- 00:26
songs to keep track of a killer paddling playlist and
Full Transcript
- 00:29
we're being asked which bits should be declared private Well
- 00:33
i don't want bring song name being that we're writing
- 00:36
an access or method called get song name specifically teo
- 00:39
get data from song name the string song name should
- 00:42
indeed be private things like this A private variable is
- 00:45
like your friends Your friend is overprotective of her kat
- 00:48
so she doesn't let anyone see it or pet it
- 00:51
However if you want your friend will bring the cat
- 00:54
out of the house and let you see it pet
- 00:56
It will bring the cat out whenever you ask her
- 00:58
to just his access Her methods bring private variables out
- 01:02
Julia item to get song name is our access or
- 01:05
method Making it private would make it possible to access
- 01:09
song ing item three hour print function Well it'll also
- 01:12
needed to use definitely should not be driving That means
- 01:15
only item one should be private and our answer will
- 01:18
be a but wait why even use successor methods at
- 01:21
all Couldn't we just make strings public Then we could
- 01:24
read from them any Time from anywhere in the program
- 01:27
without having a father with access or method Well that's
- 01:29
true there's no law against it But doing things this
- 01:32
way is the best practice gives us what's called an
- 01:34
abstraction layer well imagine this You've written a huge programme
- 01:38
and in various places throughout your accessing variables directly Well
- 01:42
values were getting changed over here accessed over here Change
- 01:45
down there it's bedlam way have mutate er methods so
- 01:49
that users can't change data any which way they want
- 01:51
you taters finally all the request to change data for
- 01:55
one checkpoint and make sure users are not changing data
- 01:58
in a bad way Blacks esther's you're just annoying repercussion
- 02:02
of using mutated by making variables private and edited on
- 02:06
ly through mu taters we essentially lock off all access
- 02:09
to the variables Thus we need access er's toe let
- 02:12
users get the values of the private variables Tons have
- 02:15
overkill for a simple project where you keep track of
- 02:18
a playlist well maybe but it's a good habit tohave
- 02:20
And when your simple project balloons into an enterprise level
- 02:23
canoe related media organizational solution well you'll be glad it's 00:02:27.51 --> [endTime] there
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