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AP Computer Science A Videos 108 videos

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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.

Language:
English Language

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]

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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