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Classes and Objects Videos 18 videos

AP Computer Science 2.3 Classes and Objects
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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 1.1 Classes and Objects
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AP Computer Science: Classes and Objects Drill 1, Problem 1. Which of the following is a correct {/* Implementation */} for the isInsect method?

AP Computer Science 1.3 Classes and Objects
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AP Computer Science 1.3 Classes and Objects. Which of the following should be declared as a static variable?

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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?

Language:
English Language

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

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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