Java OOP Exercise

Question 1

You are tasked to design an application to keep track of sales for your company. Sales should be tracked for two types of accounts: supplies and services.

Complete the following:

• Create a UML class diagram for the Account inheritance hierarchy. Your subclasses should be Supplies and Services.
• All sales accounts will have an account ID (accountId).
• You will need attributes to keep track of the number of hours (numberOfHours) and rate per hour of services provided (ratePerHour).
• You should also keep track of the number of items sold (numberOfItems) and the price per item for the sold supplies (pricePerItem).
• All classes should have a constructor.
• Add getters and setters to all of your classes.
• Override the method toString in all 3 classes.
• Add a method to calculate the sales in each class [calculateSales()].

Question 2

In NetBeans, implement your account class diagram created earlier.

Complete the following:

• Your Java project should include 3 classes: Account.java, Services.java, and Supplies.java.
• There should be implemented constructors for each class.
• The toString() method should be overridden to provide a readable string representation of each object.
• Getters and setters need to be implemented to enforce data hiding.
• The calculateSales() method should be implemented for all classes Consider having the calculateSales() as an abstract method for the Abstract Account class.
• In addition, you need to create a test class companySales.java that tests each subclass's constructor, toString(), and computeSales().
• You need to create an instance of each subclass.
• Input can be hard-coded or entered by the user.
• You need to call the method calculateSales() for each instance.
• You need to print each class info using its method toString().
• Code should be fully commented.
• Program flow should be logical.

Question 3

What type of relationship is composition commonly called and why.

Explain the "catch or declare" requirement of Java exception handling.