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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?

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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

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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