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Inheritance, Abstraction, and Polymorphism Videos 17 videos
APCS: Inheritance, Abstraction, and Polymorphism Drill 1, Problem 2. Which of the following is the correct way to begin writing your class?
AP Computer Science 1.1 Inheritance, Abstraction, and Polymorphism. Which of the following are correct?
AP Computer Science 1.3 Inheritance, Abstraction, and Polymorphism. Which of the following is true?
AP Computer Science 3.1 Inheritance, Abstraction, and Polymorphism 20 Views
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Description:
Here we're looking for the correct implementation of the "compareTo" function. Shall we compareTheeTo a summer's day? Eh, probably not a bad idea. Flattery will get us everywhere.
Transcript
- 00:04
And here's your shmoop du jour brought to you by the most
- 00:06
[Man transforms apple and christmas tree into pineapple] Christmassy of apples the pineapple consider the following code segments
- 00:19
assume that red and green are the only two apple colors and green apples are
- 00:24
better than red apples due to their superior taste and crunch do agree that
- 00:28
golden delicious apples are actually the best but that doesn't fit into this [Man throws away golden apple]
Full Transcript
- 00:31
logic so we'll keep it simple and show Granny Smith some love.. The compare to
- 00:37
function should return a positive value if the Apple is better than the other
- 00:41
Apple a negative value if the Apple is better and zero if the two apples are
- 00:47
equal i.e they're of same color well which of the following is a correct
- 00:51
implementation of the compared to function we can already eliminate choice
- 01:00
A and B they return a string minus a string the return type of the Apple
- 01:04
compared to must be an int so the other three choices are similar to each
- 01:08
other let's break them down. Choice E returns a negative value of the
- 01:12
comparison between the string value of the other color and the apple color this
- 01:17
means that the Apple color was green in the other color was red the string [Green and Red apples appear in a kitchen]
- 01:20
compared to would return a positive value the Apple compared to then returns
- 01:25
the opposite of this value in this case we're turning a negative value we want a
- 01:29
positive value returned if the apples green all right so choice D compares the
- 01:33
string value of the apple color to the other color but the apple color with [Green and Red apple in a bowl]
- 01:37
green and the other was red. This would return a negative value this is also
- 01:40
incorrect choice C compares string value of the apple color to the other
- 01:45
colors, this would return a negative value if the apple color was green and the other
- 01:49
was red but the Apple compareto method returns the opposite of this value this [person punches negative value off a table]
- 01:54
would be a positive value which is exactly what we want, so answer C...
- 01:59
next time we'll explore another cool crossbreed..snape ple yeah remember that
- 02:04
guy... [Snape and apple transform into snapple bottle]
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