AP Computer Science 1.1 Standard Data Structures

bessie for which of the following method calls will result

in an error and hear of potential answers Roman numerals

there Well this questions asking us about calling methods which

is pretty much a day to day thing in java

By now you've probably read a bit about classes relationships

and methods and could take a stab this question but

let's fully go over the nature of what we're dealing

with Imagine the following a super class vehicle which branches

down with a few subclass is called minivan motorcycle and

bicycle vehicle would contain members that could be useful tow

any type of vehicle number of wheels propulsion method whatever

you need Really the methods in the minivan class would

be specific to minivan objects Open sliding door full down

rear seats insist i am still cool it's on a

ce faras our question goes it's asking us which of

the attempts to call the method print mu will not

work well The question by design doesn't give us complete

information so we'll have to make a couple educated guesses

based on programming conventions for one will assume that animal

is a super class and that cow is a subclass

of it seems likely that animal and cow have an

inheritance or is a relationship since cow is a gn

animal and second will assume that print mu is a

method belonging to cow rather than the annals Not every

animal moves but most are all cows do so with

that in mind and with our snippet of code that

creates an animal object as a and a cow object

is b which of these attempts at calling print move

will not work We'll attempt one looks good b is

our cow object and this line calls the print moon

method appropriately attempt to looks a little weird What with

these parentheses all over the place we're casting b to

an animal and trying to call print move on it

Even though b is a cow the computer thinks it

is an animal because we've cast it so it'll give

us an error because print move doesn't exist in the

animal class In ten three uses object a an animal

without casting It is a cow so no dice there

One is a legal call but two and three or

not that means our answer is a hay If you

heard about the platypus that called customer service yeah he 00:02:37.935 --> [endTime] couldn't figure out why he got a bill