Object oriented programming - class design confusion

Question

I am trying to wrap my head around object oriented programming.

My understanding is that we have objects so we can design our programs to mirror real-life objects.

Answer 1

I tend to think about:

Is a

Has a

So, an apple is a fruit, so inheritance makes sense.

But, fruit has (is) eatable may make sense, but that shows it is a property of fruit, not an action (method).

For example, you may have unripened apple, that would not be edible (eatable) so you could then set this property.

Now, whatever is going to eat this you could set whether an apple is part of it's diet.

Now Has a would be for composition. So, an apple has a seed would mean that seed doesn't extend apple, but an apple would have a collection of seeds.

So, you do have a design problem, and I hope that these two concepts may help to clarify.