ShmoopTube

00:00

Sorry And here's your smoke Dude you're brought to you

00:05

by crackpot marketing schemes Whether you need a comically huge

00:09

pencil emblazoned with your logo or brandon toilet seat covers

00:15

Let a crackpot marketing scheme change the way you do

00:17

business All right consider the following declarations Find a bee

00:30

Which of the following is not a legal method Call

00:34

shmoop yeah but near the potential Answer a lot of

00:39

roman numerals and remember roman soldier of walk into a

00:43

bar with girlfriend orders five years Okay sounds like we're

00:47

being asked which of the given method calls art in

00:50

fallon But what on earth are method calls and when

00:53

will you ever use it Well typically large java project

00:56

will be split up into separate classes classes to make

01:00

code more manageable We might have one class handling saving

01:04

and loading a file another class handling networking class handling

01:08

graphics and so on That way when there's a bug

01:11

in a certain function or the code needs to be

01:13

modified all the relevant code is in one place The

01:16

main class will then call various methods from other classes

01:19

is needed right Well small programming projects may not need

01:23

so many separate classes but as things get more complicated

01:26

while it helps a great deal the thing about how

01:28

small company might be if just one or two people

01:31

handled everything in a garage Well that's perfectly manageable because

01:35

the relatively small operation with a little work to do

01:37

but a large company of dozens or hundreds of people

01:40

would have to be split into departments each with different

01:43

tasks like think about how hard it is for amazon

01:45

the ship product right And when it's time to do

01:48

something with the same marketing you'd have to give him

01:50

a call Yes hello marketing department We need to get

01:53

our name out there and i'm thinking pigeon sweaters will

01:56

put thousands of tiny sweaters on pigeons all over the

01:59

city with our branding all over them they'll be everywhere

02:02

can fail right We're calling elsewhere to make a request

02:05

is the same thing we're doing with method calls Yes

02:08

with fewer pigeon sweat and now let's look at our

02:11

options and figure out which are invalid Option one tries

02:15

to call a method with object see but see is

02:17

just a null object and hasn't been specified as a

02:20

new anything so option one won't work at all Option

02:24

two tries to call the shed leaves method with object

02:26

b which looks like it's gonna work Object is in

02:29

oak object and the shed leaves method resides within the

02:33

class Looking good Option to option three tries to call

02:37

the shed leaves method with object a but a is

02:39

a pine object The pine class doesn't contain a shed

02:43

leaves method It's only got shed needles Option three is

02:47

not going to cut it That makes our answer D

02:50

because options one of three are invalid and so our 00:02:55.383 --> [endTime] pigeon sweaters

Full Transcript