Explain the following UML ClASS DIAGRAM SaleShop-billing: Billing-products: Productshopproducts: ProductsnewSale: Sale+intializeProducts ()+startBilling+Sale ()+getDiscountPercentage ()+calculateCostProductBilling-name: String+getDiscount ()-price: double+Product ()+getName ()+getPrice ()+setName ()+setPrice ()SeasonalBillingNormalBillingLoyaltyBillingSaleBilling+getDiscount ()+getDiscount ()+getDiscount ()+getDiscount ()

Aggregation: The aggregation relationship is also known as “has-a” relationship. The aggregation…

Answered: Sale Shop -billing: Billing -products:…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Explain the following UML ClASS DIAGRAM

Sale
Shop
-billing: Billing
-products: Product
shopproducts: Products
newSale: Sale
+intializeProducts ()
+startBilling
+Sale ()
+getDiscountPercentage ()
+calculateCost
Product
Billing
-name: String
+getDiscount ()
-price: double
+Product ()
+getName ()
+getPrice ()
+setName ()
+setPrice ()
SeasonalBilling
NormalBilling
LoyaltyBilling
SaleBilling
+getDiscount ()
+getDiscount ()
+getDiscount ()
+getDiscount ()

Expert Solution

Step 1

Aggregation:

The aggregation relationship is also known as “has-a” relationship.
The aggregation relationship states that objects of one class contain objects of a different class.
For example, consider a quiz, which consists of questions. It can be said that the class “Quiz” aggregates the class “Question” because each quiz has one or more questions.
In the UML notation, a line with a diamond-shaped symbol attached to the aggregating class denotes aggregation

Inheritance:

Inheritance is the concept of inheriting the members and properties of a base class from the derived class.
- The main advantages of inheritance are,
  - Code re-usability and fast implementation.
  - Reduces the size of the program code.
- There are five types of inheritance:
  - Single inheritance
  - Multiple inheritance
  - Hierarchical inheritance
  - Multilevel inheritance
  - Hybrid inheritance
- If a subclass inherits a base class, then the member functions and data members of the super class can be accessed by the derived class.
  - But the derived class does not inherit the constructors from the base classes; each derived class should contain individual constructors.

Step 2

Explaining the diagram:

The given UML diagram is a class diagram. In class diagram, the rectangular boxes are used to represent the classes.
The arrow lines are used to show inheritance relation between two classes. The line with diamond shaped symbol is used to show the aggregation relationship between the classes.
There are eight classes are in the diagram. That are,
- Shop
  - This class is used to represent the shop.
  - Class members are, “shopProducts”, “newSale”, “initializeProducts()” and “StartBilling()”.
- Sale
  - This class is used to represent the sales.
  - Class members are, “name”, “price”, “Product()”, “getName()”, “getPrice()”, “setName()” and “setPrice()”.
- Product
  - This class is used to represent the product.
  - Class members are, “Billing”, “products”, “Sale()”, “getDiscountPercentage()” and “calculateCost()”.
- Billing
  - This class is used to represent the Billing.
  - Class members are, “getDiscount()”.
- SeasonalBilling
  - This class is used to represent the seasonal billing.
  - Class members are, “getDiscount()”.
- NormalBilling
  - This class is used to represent the normal billing.
  - Class members are, “getDiscount()”.
- LoyaltyBilling
  - This class is used to represent the loyalty billing.
  - Class members are, “getDiscount()”.
- SaleBilling
  - This class is used to represent the sale billing.
  - Class members are, “getDiscount()”.

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