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Playlist AP® Computer Science: Classes and Objects 17 videos
AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?
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AP Computer Science 3.2 Classes and Objects 183 Views
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Description:
AP Computer Science: Classes and Objects Drill 3, Problem 2. Which of the following is a correct implementation of the getPaddlerName accessor method?
Transcript
- 00:00
Sorry And here's your shmoop du jour brought to you
- 00:05
by access or methods access or methods I didn't even
- 00:09
access refrigerator They're mine Yeah shmoop drinking song Which of
- 00:22
the following is a correct implementation of the get paddler
- 00:25
name access or method And hear the potential answers thinking
Full Transcript
- 00:31
thinking like back All right here we go This question
- 00:39
is more or less a matter of syntax But wait
- 00:42
What is an excess or method anyway And what's the
- 00:44
point of using one Well it's essentially just a small
- 00:47
method written to retrieve the data from a private variable
- 00:51
But why bother Isn't that needlessly complicated Why not just
- 00:55
make our variables public and reader Change him wherever we
- 00:58
want Well because that's like flying without a net If
- 01:01
we funnel every request for a variables data through access
- 01:04
or mutate er methods we get another place to put
- 01:06
code to act on that date each and every time
- 01:09
it's accessed or modify Imagine this you're creating a huge
- 01:13
game where players are in gold by defeating monsters and
- 01:16
later they can return to town and buy items with
- 01:18
their goal We'll call it world of shmoop craft Yeah
- 01:22
very retold in there with you in the area of
- 01:24
code where monsters were fought and gold is granted we'll
- 01:27
be adding a small number of gold to the players
- 01:29
Gold amount variable every time a monster is defeated And
- 01:33
when players go to the shop to buy things we
- 01:35
subtract the necessary Amount from the same variable No access
- 01:38
or or mutate or methods to check up on us
- 01:41
were totally naked here Good Now let's say the game
- 01:45
has been released to the public and thousands of people
- 01:48
are playing games with each other And the mischievous lord
- 01:50
beef is has discovered something interesting about your game If
- 01:54
he stands in a certain spot holds the attack buttoned
- 01:56
down he can slay the spider queen with one swipe
- 01:59
over and over and over forever believes a roll of
- 02:02
quarters on the keyboard to hold the button down and
- 02:04
lets it run overnight amassing a huge fortune and completely
- 02:08
throwing off the in game economy Well everyone else is
- 02:11
harder and fortune is worthless in lord be fist ruins
- 02:13
the game Thanks for nothing lord beef How could access
- 02:17
or um you tater methods have prevented this catastrophe Well
- 02:20
a lot of ways actually when using accessory mutate or
- 02:23
methods tto handle the bold amount variable One possibility would
- 02:26
be insert some logic that checks whether the amount of
- 02:28
gold has been modified in the last few seconds and
- 02:31
if so does not allow it to be modified again
- 02:34
I don't keep anyone's gold amount from dramatically skyrocketing in
- 02:37
case of some un forcing repeating issue somewhere or just
- 02:40
spitballing here since they're likely be a variable story number
- 02:43
of bad guys each player has slayed a check would
- 02:46
be implemented in the accessory mutate Er methods there if
- 02:49
any player or beef is included manages to somehow sleigh
- 02:52
and otherwise impossible amount of enemies in one day say
- 02:55
a thousand a special condition could be triggered Handle it
- 02:59
Maybe it even rig something amazing like an automated text
- 03:02
in the middle of the night saying you need to
- 03:04
wake up and take care of lord be fist but
- 03:06
imagine explaining that one to your spouse Really though there
- 03:10
are probably thousands of creative ways you could use accessory
- 03:13
indicator methods to protect the sanity of your variables It
- 03:16
might seem tedious to implement those methods but they'll save
- 03:19
you in the long run Hart's back to our question
- 03:21
which is the correct way to set up in access
- 03:23
or method to get the variable paddler name option is
- 03:27
a routine that simply prince paddler name to the console
- 03:29
that's no good We want to return the variable so
- 03:31
we can work With it option c also just prince
- 03:34
paddler name both and we're out b d any all
- 03:38
returned the variable but b is being declared as a
- 03:41
private methods No dice there Option d doesn't specify the
- 03:44
words string in its constructor so nothing be option is
- 03:48
right on the money It's public it specify string and
- 03:50
it returns the variable and in a statement that's never
- 03:53
been uttered in the entire history of humanity Good job
- 03:56
everyone We've saved the freestyle canoeing competition from the scores 00:04:00.7 --> [endTime] of lord beef
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