OOP: When is it an object?

Question

I\'m trying to understand object orientation. I understand it a little bit of course, but sometimes I\'m not 100% clear. How do you decide what should be turned into an object (

Answer 1

You should also think about how many of the sub-objects you need. A door has one handle not four or five and not a list of handles. Also do the sub-objects have properties of their own? Is the color or the material important? Then better keep the handle as a separate object.