Some MCQ's on code

[errant stump]

<@&987246883653156906> please have a look, thanks.

[errant stump]

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Sure, I can help you review some multiple-choice questions on Java code. Please provide the questions and their options.

[crisp crown]

do u have a specific question?

(note that we wont just tell u the correct solutions)

[frail egret]

yeah what is Extensible in these context I didn't even understand it
those are previous year oracle hiring Questions and I am practicing them

[frail egret]

can I know y?

[crisp crown]

ur supposed to learn. and just telling u "check this this and that" wont help u learn

especially in case its an exam u might be taking right now, in which case it would be cheating

(which its not in this case)

extensible in this case means what they said right next

"to be able to handle more types"

right now, the code can handle truck, car and bike

[frail egret]

U can answer me a day later too but just le me get the understanding of Extensible

[crisp crown]

what if u add 4 more types tomorrow

u would have to come back to this method and add like 10 more lines

they are asking how u can improve the code to make that easier

or more natural

[frail egret]

making vehicle as a parent class for various child class?

[frail egret]

then it means a switch case?

[crisp crown]

well. id say it isnt super clear what they want from u

[frail egret]

i have no Idea as I got these pics over telegram to help prepare for placement drive

[crisp crown]

what would u say are ways to improve this code?

[frail egret]

I too got confused by the context

[crisp crown]

with respect to the three answers

im not really confused, but i think that 2 answers could be reasonable to pick

although im fairly confident about which they want u to pick

would u know how to write the code for all 3 answers? or is any of the answer confusing u?

[frail egret]

I got 1 and 2 as a answer but Its not mentioned multiple options right !

[frail egret]

code is simpler these Structural or design Questions make me mad as a new programmer

this is more confusing for me

[crisp crown]

well, u gotta pick one of them. and i think its fairly clear which to pick, once u actually write down the code for the 3 answers

[frail egret]

switch case is the simplest ?

[crisp crown]

but is it also helping in making the code natural for extension?

what if u have 200 types

then this method will end up having 200 switch cases

really long method

[frail egret]

no then polymorphism

[crisp crown]

i agree that a switch case is more readable than the ifs here. but is it really what they want, design-wise?

how would the polymorphic solution look like? would there be if-cases still?

where and how would the emission be computed then?

still in vehicle?

[frail egret]

design is not tough to us yet I mean not as a beginner

[crisp crown]

design is the single thing that separates a junior from the senior

[frail egret]

IDk what the 3ed option does then

it does ntg

[crisp crown]

im not really sure u got the 2nd answer yet, cause u constantly evade my questions on it

[frail egret]

so the best among those 3 are switch or polymorphism

[crisp crown]

i wont tell u which is best before im sure u understood it

please dont evade

how and in which class would the carbon emission be computed in the second (polymorphic) solution?

[frail egret]

ok sir can u answer me later so that count cheating as u imagine

[crisp crown]

it wont help u to remember by heart which answer to check

when u take the exam, it will be different questions

u have to actually understand it

[frail egret]

for each class they must compute it differently

[crisp crown]

how would that look like? could u write a quick snippet?

class Vehicle {
 // ...
}

class Car extends Vehicle {
 // ...
}

[frail egret]

let me put it right switch wont work u have to manually do it
but in case of polymorphism can do it

[crisp crown]

how would polymorphism make it work better

please fill in the blanks of the above snippets

[frail egret]

class Vehicle {
 // ...
}

class Car extends Vehicle {
 carbonEmission(){
   return self.engineSize * self.tire * 2.5; 
 }
}

[errant stump]

Detected code, here are some useful tools:

Formatted code

class Vehicle {
  // ...
}
class Car extends Vehicle {
  carbonEmission() {
    return self.engineSize * self.tire * 2.5;
  }
}

[crisp crown]

and what would u have in Vehicle?

[frail egret]

just make a over ride

wait a sec

class Vehicle {
 carbonEmission(){
   return self.engineSize * self.tire; 
 }
}

class Car extends Vehicle {
 @override
 carbonEmission(){
   return self.engineSize * self.tire * 2.5; 
 }
}

[errant stump]

Detected code, here are some useful tools:

Formatted code

class Vehicle {
  carbonEmission() {
    return self.engineSize * self.tire;
  }
}
class Car extends Vehicle {
  @override
  carbonEmission() {
    return self.engineSize * self.tire * 2.5;
  }
}

[crisp crown]

okay, alright

some minor issues in that snippet, but doesnt matter

seems u got the overall idea

👍

so this approach will create a way to naturally extend the logic with more types

[frail egret]

this was very cool learning with u sir!

[crisp crown]

instead of having a centralized place that controls them all

ur welcome

now to ur second question

[frail egret]

what about this one

this is literally out of my mind

[crisp crown]

lets talk about each option and see if it helps

it should be very clear then

the problem they are asking u to solve is to make the code more readable and easier to understand

how would the first option look like?

[frail egret]

it will make a looot of nesting then

similarly 2ed option is a business logic to change

[crisp crown]

if (user.experience > 6) {
  if (user.earnings >= 5000) {
    ...
  }
}

yes, nesting

does that help?

is it more readable?

[frail egret]

it is but its more nested isn't it?

[crisp crown]

what if there are 20 conditions

ull get hadouken

https://i.imgur.com/rM0FTLn.png

not readable

so that option is from the table, not good

second answer, as u said, changes the logic

so thats from the table as well

what about the last answer, else statement

[frail egret]

3ed one is the same no change the readability will decrease in function

4th adding a else at the end will have no change as else doesn't carry any condition

[crisp crown]

well, the question would be rather what to put into its body

but yes

[crisp crown]

disagreed 😛

if (isRisingTalent(user)) {
  sendInvitation(user);
  user.risingTalent = true;
}

this is MUCH more readable

u can read and understand this logic in a second

while for the old code, u need to read for 15 seconds

[frail egret]

ho!

visualizing the code matters

[crisp crown]

yes

and then u put the conditions into a helper

private static boolean isRisingTalent(User user) {
  return user.experience > 6
    && user.earnings >= 5000
    && user.contracts > 60
    && user.warnings == 0;
}

which, in itself, is also easy to understand

since its now decoupled from the logic

and has a fitting name

[frail egret]

dam

its super cool to learn those

thanks a loot sir

shall i close the Questions?

[crisp crown]

if u dont have any questions to that anymore right now, sure 🙂

[frail egret]

thanks sir ❤️