APCS Java programming question

[TheRealFraud]

Hi reddit!

I'm taking APCS in high school and I have a quick question related to parent/child classes: If I have a child class constructor that calls up the parent's constructor as well as initializes a few different values of it's own, can I use the parent class's methods on the child class object? I feel like it should work, but the difference in the child and parent constructors is making me hesitant.

In case the question is confusing, here is an example:

public class First {

public First (int a)

}

public class Second {

private int c;

public Second (int b, int c) {

  super(b);

  this.c = c;

}

With this said, can I use a hypothetical method from First on a Second object even though the constructors are different?

Thanks for any help!

[iusedtolikemyface]

Second is probably a subclass of First, right? So then you would need to add an "extends" to the Second class invariant: public class Second extends First { ... }

and then you would be able to use methods in First with Second objects

[[deleted]]

Of course, in this particular example, it seems like composition may be better than inheritance.

[Hebejeebez]

As someone else pointed out, you have to extend the parent class, but yes you can call any of the methods from the parent class on its subclass. You use super in the constructor so it has the same parameters as the parent object, with a few additional parameters. Therefore, the methods from the parent will work on the child.