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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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