Customer

Write a class for modeling a customer. A customer knows its arrival time $($represented by an int value$),$ its initial number of items, as well as the number of items remaining to be processed. The maximum number of items per customer is $($MAX$\_$NUM$\_$ITEMS$).$

What are the instance variables?

What are the class variables?

The constructor has a single parameter. It specifies the arrival time. The initial number of items is determined when the object is first created using the following formula:

Random generator;

generator $=$ new Random$()$;

int numItems;

numItems $=$ generator.nextInt$($MAX$\_$NUM$\_$ITEMS$-1)+1$;

Here, we make sure that no customer would show up empty handed!

The instance methods of a customer include:

int getArrivalTime$()$ returns the arrival time;

int getNumberOfItems$()$ returns the number of items remaining to be processed;

int getNumberOfServedItems$()$ returns the number of items that have been processed;

serve$()$ decrements by one the number of items of this customer.