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Description:

AP Computer Science 3.4 Standard Data Structures. Which best describes the functionality of the remove method for an ArrayList?

Language:
English Language

Transcript

00:04

And here's your shmoop du jour brought to you by an iterating

00:06

ArrayList it'll throw you for a loop all right which best describes the [People riding rollercoaster]

00:11

functionality of the remove method for an ArrayList at your potential answers

00:16

lot of text......... all right arrays that array

00:24

lists are similar but standard arrays have some limitations the biggest tubing [Man blowing whistle with stop sign]

00:28

that arrays have a fixed size and that elements can't be added or removed this

00:33

once you build an array you're pretty much stuck with the original size you [Man moving array side to side]

00:37

specify yeah you can find ways to sidestep it you can write methods to

00:42

build a new array consisting of an old arrays contents plus or minus whatever

00:46

elements you want to add or remove but it's a little janky though and at that [Computer burning]

00:52

point you're just recreating a lesser version of an ArrayList so you may as [Man throwing work on his desk]

00:56

well ride dragons look at you so ArrayList removed metal works much like [Man riding a dragon]

01:01

you'd expect let's say we have four elements in an array list called the

01:05

scene bad movies jingle all the way police academy first kid and house cast

01:11

our police academy isn't a sin bad movie so we'll remove it from the arraylist [Police men talking on the street]

01:15

and there it goes with trailing thing's sliding upward in line but now

01:20

let's look at the potential answers would fit option a well it removes the

01:24

element at the input index and moves all elements right this way from the front

01:30

fill the spot and adjust the size wait whose elements to the right mmm nope [Man looking confused]

01:35

that's not what happens houseguests moved left trailing elements will always

01:40

move left why because indexing always begin to add zero option B also says

01:46

things move the right which isn't going to work option C well it removes the

01:50

element at the input index 0 so far so good and we move all the elements left

01:54

from in to fill the spot and yep adjust the size right and returns the remove

01:59

element yeah all right the remove method does indeed [Remove method lands in middle of road]

02:03

returned the element you've just removed in case you needed it for something so C

02:08

looks like our answer but let's check the other B is the same answer C but

02:11

without returning your moved element so no option E removes the element from

02:15

the list returns the element and so on but doesn't mention anything about

02:18

moving the remaining elements all rights are there now that wasn't Sinbad or so

02:24

bad was it [Man singing on stage]

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