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Java Community | Help. Code. Learn.•12mo ago

what’s the difference between these two pieces of code?

I was experimenting with these two pieces to see if they still have the same output and I thought they would but I keep running into an error for the replit one (the one with the dark mode bg) The one in the light mode bg is the original piece of code and I tried to create the same output differently in the one with the dark mode bg but idk what is wrong Can anyone pls explain/help me

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47 Replies

JavaBot•12mo ago

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applesandhoneyOP•12mo ago

The output for the light mode bg is supposed to be 30 And that’s what im trying to get in the dark mode bg code too but idk what is wrong

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noComment | Kez•12mo ago

There is no this.nthat is part of the Overtime class only n since it is the argument of the constructor Other than that I think it's pretty much accurate

applesandhoneyOP•12mo ago

So I just write Overtime ot = new Overtime(n); ? But doesn’t Overtime ot = new Overtime(this.n); Basically just pass a reference of the parameter variable n? So isn’t it basically the same thing then?

noComment | Kez•12mo ago

no this.n is an instance variable call there is no instance variable called n only an argument that is only accessible within the method it`s an argument of see ./run

public class Main {
    int i = 5; //this is an instance variable;
    public static void main(String[] args) {
      Main m = new Main();  
      m.foo(10);
    }
    void foo(int i){//the i here is only reachable within these brackets
        System.out.println(i);//calls the argument
        System.out.println(this.i);//calls the instance variable
    }
}

public class Main {
    int i = 5; //this is an instance variable;
    public static void main(String[] args) {
      Main m = new Main();  
      m.foo(10);
    }
    void foo(int i){//the i here is only reachable within these brackets
        System.out.println(i);//calls the argument
        System.out.println(this.i);//calls the instance variable
    }
}

I Run Code•12mo ago

Here is your java(15.0.2) output @noComment | Kez

10
5

10
5

applesandhoneyOP•12mo ago

ohh okay wait so in the code with the light mode bg, Overtime ot = new Overtime(this) does it just take the entire object that is passed to it?

noComment | Kez•12mo ago

this in this context passes the current Pay object into the constructor of Overtime an object is an instance of a class it is ~~basically~~ the same

applesandhoneyOP•12mo ago

and since its one.calculatePayWithOverTime it passes one into overtime later so it depends on which object we call the calculatePayWithOverTime then right,

noComment | Kez•12mo ago

Well I don't get why you gave calculatePayWithOverTime an argument anyways just delete the argument make the call Overtime ot = new Overtime(this); and be done with it

applesandhoneyOP•12mo ago

i did it cause i thought it'd be the same as Overtime ot = new Overtime(this); but just that its passing the object as a parameter variable?? im not sure if i make sense but got it, this. is just an instance variable call

noComment | Kez•12mo ago

well it is the same as long as you pass the same object into it can also be an instance method call and this without the . just represents the instance

applesandhoneyOP•12mo ago

so isnt Overtime ot = new Overtime(this.n); passing the object? or not cause like u said n is a parameter and not instance also if i did just Overtime ot = new Overtime(n) would it mean the same thing?

noComment | Kez•12mo ago

this.nwont work here because there is no instance variable called n

applesandhoneyOP•12mo ago

okay

noComment | Kez•12mo ago

and making it Overtime ot = new Overtime(n) kind of defeats the purpose of the method

applesandhoneyOP•12mo ago

oh cause then i can just call overtime from main

noComment | Kez•12mo ago

The method is supposed to act upon the instance it is called from

applesandhoneyOP•12mo ago

okay

noComment | Kez•12mo ago

so we call this not n the method is not supposed to have an argument why would you do that?

applesandhoneyOP•12mo ago

no like it was in response to how u said it defeats the purpose of the method, like thats why it defeats the purpose?

noComment | Kez•12mo ago

it defeats the purpose because you could just pass another pay object which wouldnt make sense

applesandhoneyOP•12mo ago

okay

noComment | Kez•12mo ago

Pay kezsPay = new Pay(5);
Pay apllesandhoneysPay = new Pay(10);
applesandhoneysPay.calculatePayWithOverTime(kezsPay);

Pay kezsPay = new Pay(5);
Pay apllesandhoneysPay = new Pay(10);
applesandhoneysPay.calculatePayWithOverTime(kezsPay);

doesn't really make sense right?

applesandhoneyOP•12mo ago

yeah it doesnt

noComment | Kez•12mo ago

exactly

john•12mo ago

public class Pay

{
    private double pay;
    private Pay n; 

    public Pay(double p)
    {
        pay = p;
    }

    public double getPay()
    {
        return pay;
    }

    public void calculatePayWithOvertime(Pay j)
    {
        // this Pay object is passed to the Overtime constructor
        n = j;
        Overtime ot = new Overtime(this.n);
        pay = ot.getOvertimePay();
    }
}

{
    private double pay;
    private Pay n; 

    public Pay(double p)
    {
        pay = p;
    }

    public double getPay()
    {
        return pay;
    }

    public void calculatePayWithOvertime(Pay j)
    {
        // this Pay object is passed to the Overtime constructor
        n = j;
        Overtime ot = new Overtime(this.n);
        pay = ot.getOvertimePay();
    }
}

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applesandhoneyOP•12mo ago

it gives me 30 now sry ik i made it extra complicated but i just wanted to see if there was any other way to get 30 using this

noComment | Kez•12mo ago

are you trying to make fun of me

applesandhoneyOP•12mo ago

no i just was trying to get another way

noComment | Kez•12mo ago

okay

applesandhoneyOP•12mo ago

sry i didnt mean it that way

noComment | Kez•12mo ago

yeah I was a bit harsh sorry

applesandhoneyOP•12mo ago

i shared cause i wanted to ask that in the real world would this still be acceptable or not cause ik u said last time that theres a style of writing code

noComment | Kez•12mo ago

well not really

applesandhoneyOP•12mo ago

oh okay yeah im just overcomplicating it

noComment | Kez•12mo ago

since you still have this issue

applesandhoneyOP•12mo ago

ohh

noComment | Kez•12mo ago

the method is very clearly not intended to have an argument

applesandhoneyOP•12mo ago

and since i call the method on the one object, it should just pass the one object?

noComment | Kez•12mo ago

exactly in this case at least since it is a method that is intended to alter the instance from which it is called

applesandhoneyOP•12mo ago

okay

noComment | Kez•12mo ago

anything else I can help you with?

applesandhoneyOP•12mo ago

nope thats good ty for ur help also sry abt that, i didnt intend to come off as rude or anything

noComment | Kez•12mo ago

Nah I just misinterpretet you are in the right If you don't need further help you can just close this post 🙂

JavaBot•12mo ago

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This post has been closed by <@1127841130252357733>.

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