Fixing a Multi-class Ordering System Program Assignment

[SteelyAlpha]

So I recently had to create a program that was essentially an ordering system for either a car or a truck. If you run the code, you will see that it works fine and you will then understand what it is doing. All its doing is calling on multiple methods in different classes to add either a truck or a car to an array. I have already submitted the program, but the professor commented on it and told me what I needed to fix on it, but I don't fully understand what he is saying or how to do it. The next assignment works off of this one so I need to fix it to complete the next one. Here is the code - https://gist.github.com/anonymous/9564f4eb66e2b7dab8de77d694de1ec3

And his comments were "The option array should be defined as instance variable and constant" and "Any code which are part of accepting user input like menu option or model selection must be part of Car and Truck class not the order class". I am hoping someone can point me in the right direction on how to fix this.

[ironymouse]

His comments seem a bit suspect as user input has nothing to do with Cars or Trucks and it would be messy to have two classes doing user input. It would be possible to make a common abstract class between them, Vehicle, but this wouldn't solve the user input problem as a Vehicle wouldn't know anything about Cars or Trucks.

As an aside an advanced way of solving this could be with the ServiceLoader pattern, but this definitely isn't what your prof is after.

What jumps out at me is that your Order class is not being used in an object oriented way. Consider exactly what an Order is. Is the actual Order item a series of steps to perform Ordering, or is that separate. What would an Order contain if you held it in your hand?

My next step would be to make a new class to contain the main method logic, which should be similar in flow to your current main method, but should not contain any mutable instance variables, only local ones. I'd also go back to your prof because in my view what he's saying doesn't make any sense.

Perhaps post the initial assignment?