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AP Computer Science Videos 112 videos
AP Computer Science 1.2 GridWorld Case Study and APIs. What is the direction of the actor?
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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 2.4 Program Development 5 Views
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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.
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
Full Transcript
- 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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