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AP Computer Science 4.3 Classes and Objects 177 Views
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Description:
AP Computer Science 4.3 Classes and Objects. Which of the following should be declared as static?
Transcript
- 00:00
Hurry And here's your shmoop duties you're brought to you
- 00:06
by llamas that sound oddly like taylor swift a lot
- 00:12
Well you'd like to write a llama class to help
- 00:15
with keeping track of llamas on your farm This class
- 00:18
will include the following data members here Which of the
Full Transcript
- 00:22
following should be declared as static ten come on And
- 00:28
here the potential answers numerals I came to enact a
- 00:32
llama All right here we go I'm nominating All right
- 00:38
We'll recall what the k word static means when you
- 00:41
declare something to be static You're telling the computer that
- 00:43
every instance of the object will hold the same value
- 00:46
for the variable that is static saying it doesn't change
- 00:49
like idiots in congress for example let's pretend our lama
- 00:53
class has another variable called for color Well now let's
- 00:57
say we create three instances of our lama class peanut
- 01:00
carl and dahlia if we made for color static and
- 01:04
then set it to grey while every lama created would
- 01:07
turn gray But if for color wasn't static then we
- 01:10
could change each llamas colored individual in a nutshell Static
- 01:15
variables are used to signify variables that should be the
- 01:17
same Across all instances of a class and non static
- 01:21
variables used for ones that should be unique among different
- 01:24
instances got it now let's Look at our answers We're
- 01:29
looking at three way want lama named to be static
- 01:32
Well that's like asking do we want everyone that i
- 01:34
have the same name Unless you want fifty llamas running
- 01:37
at you when you call carl probably should keep along
- 01:40
the name non static Now if we look at the
- 01:43
second answer the same problem occurs We can't make lama
- 01:46
idee static because that would make every lama be indistinguishable
- 01:51
by ideas like having same social security number for every
- 01:54
llama by process of elimination That leaves us with one
- 01:58
option left that's number one but let's double check that
- 02:01
it's right we want next available I'd be the same
- 02:06
across all instances of lama Well yeah this variable isn't
- 02:10
specific to just one lama in particular rather than lama
- 02:13
class a hole so should make it static Next time
- 02:17
i'll pack a bag so we can explore more about 00:02:20.68 --> [endTime] lama
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