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Classes and Objects Videos 18 videos

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?

AP Computer Science 1.4 Classes and Objects
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In this question, which of the choices correctly constructs a Time(int hours, int minutes, int seconds) object?

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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?

Language:
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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

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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