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Computer Science Videos 112 videos

Computer Science: Setting Up Your Environment
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AP Computer Science 1.1 Classes and Objects
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AP Computer Science 1.2 Inheritance, Abstraction, and Polymorphism 369 Views


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Description:

APCS: Inheritance, Abstraction, and Polymorphism Drill 1, Problem 2. Which of the following is the correct way to begin writing your class?

Language:
English Language

Transcript

00:00

Sorry And here's your shmoop to use your brought to

00:05

you by object oriented programming It's got class that's really

00:10

funny the computer science majors around us or just rolling

00:13

on the floor right All right you would like to

00:15

define a subclass called bicycle as part of your ongoing

00:19

efforts to reduce your carbon footprint Which of the following

00:23

is a correct way to begin writing your class carbon

00:27

footprint like tires All right And here the potential answers

00:32

public clan All right well the key to answering this

00:37

question is knowing the syntax of defining a subclass in

00:40

java But what is a sub class submarine class Well

00:44

it's a lot like a normal class except a subclass

00:47

also inherits things from the super class it's extending from

00:51

so once we get set up and we're messing around

00:53

with our new bicycle class we'll be able to use

00:55

the access or methods of vehicle that we've already written

00:59

Got it all right Well this idea is known as

01:01

inheritance in object oriented programming and it doesn't involve trying

01:05

to make your distant ninety eight year old relatives think

01:08

you're interesting Anyhow this is a question of syntax and

01:12

that's In texas public class new subclass extends class way

01:18

know for a fact that bicycle is intended to be

01:20

a subclass of vehicle It hangs down like fruit on

01:24

a tree so he is certainly out He creates a

01:26

class called vehicle that extends from bicycle and it's the

01:29

wrong way around Option a is also an option a

01:32

uses new to declare the subclass bicycle exist but the

01:36

question is asking us to define it similar words but

01:39

two very different things A declaration simply says something exists

01:43

but doesn't describe what the class or function actually does

01:47

The question was asking us to define the class Instead

01:51

option b and c use the word super rather than

01:54

extends which isn't proper syntax whatsoever So that just leaves

01:58

us with d which has both the correct syntax and 00:02:00.796 --> [endTime] the classes in their proper order They were walking

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