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AP Computer Science Videos 112 videos

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Description:

Get ready to work with classes in Java. Don't worry. We've thrown some penguins in there to spice things up.

Language:
English Language

Transcript

00:04

Here's your shmoop du jour brought to you by nervous penguins [Penguins on a block of ice]

00:07

waddle they do in times of trouble all right you've been assigned to a project

00:11

in which you'll be writing a collection of classes in Java in order to model the

00:14

various species of penguins in the world today super classes penguin with a

00:18

hierarchy of subclasses organized by genus and species your class hierarchy

00:23

will be used to model penguins in zoos and wildlife preserves all over the [People photographing a penguin in a dress]

00:27

world the superclass penguin is declared as the following a subclass is to be

00:33

implemented for emperor penguins and a new data member will be added for the

00:37

age of the emperor penguin the emperor subclasses implemented as follows

00:42

alright well the print method for the Emperor subclasses intended to print the

00:46

same name information as the superclass print function and then print a

00:51

similarly labeled line for the age of the emperor penguin and return a new

00:54

line on the console for example.. For a 7 year old emperor penguin named Jane Fonda the [Jane Fonda penguin appears]

01:00

method should display the following on the console right there with the cursor

01:05

placed on a new line afterward which is a correct implementation for the

01:10

subclass print method and here are your potential answers.... alright well the

01:18

problem asked us to print the same info as the superclass penguin instead of [Photo of emperor penguin prints out]

01:22

rewriting an entire print function we can just use the keyword super to call

01:26

the super classes print function...Know this and we can eliminate all the potential

01:31

answers except for E... just to make sure this is our answer well let's check if

01:35

the rest of its correct the second line uses a print line to print out the word

01:39

age and the Emperor's age along with this the code moves the cursor to a new

01:44

line and yeah this is exactly what the question asked for so it looks like E [Penguins chase a cat]

01:48

is our answer next time we'll take a look at the penguin foot massage parlor [Penguins entering foot massage parlor]

01:53

happy feet

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