Using the state pattern, you have to implement an application that help track the item ordered from online shop. The client orders an item from online shop, then item can go to post office, then it will be delivered to the user home. Or the item after being ordered it goes to the post office, then the user will pick it up from the post office. In both cases; either take the item from the post office or has it delivered to the client's home represents the end of the process.

Q1) (2 points) Draw the class diagram that shows all classes and the role of each class?

Q2) (2) Write code of the state interface?

Q3) (6 points) Write the implementation of the ShopOrder class; most important things are the states declaration, the constructor, a function to return robot state