Equals method

[kindred jackal]

<@&987246399047479336> please have a look, thanks.

[kindred jackal]

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[dusty folio]

and what's ur question?

[deep shore]

Hey!!

public abstract class C
{
    protected int _cVal;
    
    public C()
    {
        _cVal = 2;
    }
    public C(int cVal)
    {
        _cVal = cVal;
    }
    public abstract boolean foo (int n);
}

/////////////////

public class B extends C
{
    // instance variables - replace the example below with your own
    protected int _bVal;
    
    public B(int cVal, int bVal)
    {
        _bVal = bVal;
    }
    public boolean foo(int n){
        return n==_cVal;
    }
      
}

Implement the equals method in the classes.
Objects of type C must be compared according to the _cVal attribute,
and objects of type B should be compared according to the attributes _cVal and _bVal.

Write the equals method that should be in class C:
public boolean equals (Object obj)
{
if ______
return false;
return _______
}

Write the equals method that should be in class B:
public boolean equals (C obj)
{
if _______
return false;
return _______
}

[kindred jackal]

Detected code, here are some useful tools:

[deep shore]

my question is, how do i make it equal?

sorry i accidently deleted my post after i tried to edit it

i have a uni task and that's the only question i got

i have several options

[dusty folio]

what's unclear to u?

the method is supposed to return true iff u think this and that are the same

[deep shore]

i tried to test it in some way but then i remembered i can't write objects for an abstract class

[dusty folio]

so u compare what u want to compare and then return true or false. very straightforward

[deep shore]

that's what i chose for C

that's my options for if

thats my options for return

[dusty folio]

and what's unclear to u?

[deep shore]

i'm very not sure if thats right because i've no way to test it

[dusty folio]

just type it out in ur ide and test it

[deep shore]

its compiled but i can't test it because C is an abstract class

[dusty folio]

then extend it

implement the foo method trivially

then u can test it

[deep shore]

like

to test the equals of foo?

[dusty folio]

to test the equals of C

extend C with a non abstract class D

[deep shore]

i also have a class B that extends C

[dusty folio]

i know. but that one has its own equals method

and u want to test the original

from C

[deep shore]

so i create class D with the code
public boolean foo(int n){
return n==_cVal;
}
?

did i understand?

[dusty folio]

it doesn't matter what u do in the method. u can just not do anything

foo is irrelevant to all of this

[deep shore]

i think i'm lost lol

[dusty folio]

what's unclear to u

[deep shore]

the explanation

i'm still not sure whats the code i should write to make the method equals

[dusty folio]

because u don't understand it and are just guessing?

or because u think its right but want to test it but can't bc abstract?

or what

[wild atlas]

the question is a bit awkward since objects of type C can't exist

[dusty folio]

well, they can. any subclass is a type C as well

[deep shore]

thats what i'm saying

haha

[wild atlas]

but then in a subclass you will rewrite the equals method anyway if you add new fields

[dusty folio]

and unless they override equals as well, it's relevant

not necessarily

[deep shore]

yes i tried to test my options but as i said i couldn't make a tester

[dusty folio]

it can make sense. and whether it does or not is irrelevant. it's the task at hand and it's as hard to solve it. and simple to test it

[dusty folio]

i explained to u how u can do it

im not sure what was unclear

[wild atlas]

well, technically you can subclass C and not add anything that might affect the equals check. so the answer is correct

[dusty folio]

heck, u could even just remove the abstract from it and delete the foo method. then u can test it as well

[deep shore]

i'm not sure if thats allowed lol

[dusty folio]

that's not the point

u want to test it. so test it

open ur ide, type it out and play with it

until u understand what the correct answer is and can then select it

if u don't know the correct answer yet, u essentially failed the test and should step back and play around more until u understand it

so type it out and see what works and what not. inspect what's going until ur sure

[deep shore]

thanks anyways for the help