are a virtual thing, which get characteristics in a program.
When you make an inventory program for someone who sells tables and chairs, the simplest way is to bring everything under in a category, like furniture.
To get an overview of my collection, I order my objects in categories. Every category will also be a new object.
You see 5 objects in the picture, however, in Java we will have 7 objects. Because the categories (tableCollection and chairCollection) are also objects.
We will work out this example in the next lesson when we order everything.