How to understand copy constructor better?

Question

I get how copy constructor works but i don't know why it works. I am just curious why it is necessary to initialize the constructor variables to the local variables? Like:

public Fraction (Fraction other){
this.num = other.num;
this.denom = other.denom;
}

Why do I have to do this?

Answer 1

You can do this if you want to create a real copy.

I hope my code helps you a little bit:

https://code.sololearn.com/c5xaS2p56ORh/?ref=app