Java: An Introduction to Problem Solving and Programming (7th Edition)
7th Edition
ISBN: 9780133766264
Author: Walter Savitch
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 1E
Design a class to represent a credit card. Think about the attributes of a credit card; that is, what data is on the card? What behaviors might be reasonable for a credit card? Use the answer to these questions to write a UML class diagram for a credit card class. Then give three examples or instances of this class.
Expert Solution
Program Plan Intro
Unified Modeling Language (UML)
Unified Modeling Language (UML) is a modeling language in software engineering, which is used to visualize the design of the proposing system.
- In software development life cycle, it comes under the “documenting the program” phase.
- UML is used to document the developing system; this documentation helps the end user to understand the whole project.
- It visualizes all the components used in the developed object-oriented software; it shows all the elements and its relation.
Class diagram:
Class diagram is a static model which represents the system’s static structure and its relationship using attributes, relationships, objects, and operations.
- The relationship between the classes in the class diagram is called association.
- It is represented by drawing a line called association path between classes and placing the labels in between the association path.
- The instance of one class can be associated with more than one instance of another class and it is referred as multiplicity.
Steps to create class diagram:
- Identify objects
- Identify the attributes and behaviors
- Draw association between the classes.
Representing the class diagram:
- Every class in the class diagram is represented using a rectangle.
- The rectangle is divided into three parts,
- The first part contains the name of the class
- The middle part contains the attributes and derived attributes
- The last part contains the methods.
| Class name |
|
-Attribute name |
| +Operation name() |
Explanation of Solution
Attributes:
- Initially, identify the reasonable attributes for “CreditCard” class.
- The “CreditCard” contains the card number, card name, expiry date for card, and so on.
- So, let us take the followings are the attributes for “CreditCard” class.
- “cardNo”
- “name”
- “cardExpiryDate”
Expert Solution
Explanation of Solution
Behaviors:
- Initially, identify the reasonable behaviors for “CreditCard” class.
- The “CreditCard” contains the “getCredit”, “getPurchase” and so on.
- So, let us take the followings are the behaviors for “CreditCard” class.
- “getCredit()”
- “getPurchase()”
Expert Solution
Explanation of Solution
The UML class diagram for credit card is shown below:
The “CreditCard” class is shown in the following class diagram:
Explanation:
In the above diagram,
- The class name is “CreditCard”.
- The “cardNo”, “name”, and “cardExpiryDate” are attributes of “CreditCard” class.
- The “getCredit()” and “getPurchase()” are methods or operation name of “CreditCard” class.
- “getCredit()” method is used to gets the credit card amount from bank.
- “getPurchase()” is used to purchase the products by using the credit card.
Examples of objects of this “CreditCard”class:
First object:
The first object is “customer1” for this “CreditCard” class is shown below:
Explanation:
In the above diagram,
- The “customer1” object for “CreditCard” class.
- Assign the “cardNo” as “123456”, “name” as “XXXX” and “cardExpiryDate” as “03/02/2001” are the attributes of the “CreditCard” class.
Second object:
The second object is “customer2” for this “CreditCard” class is shown below:
Explanation:
In the above diagram,
- The “customer2” object for “CreditCard” class.
- Assign the “cardNo” as “234578”, “name” as “YYYY” and “cardExpiryDate” as “12/11/2022” are the attributes of the “CreditCard” class.
Third object:
The third object is “customer3” for this “CreditCard” class is shown below:
Explanation:
In the above diagram,
- The “customer3” object for “CreditCard” class.
- Assign the “cardNo” as “341579”, “name” as “ZZZZ” and “cardExpiryDate” as “01/02/2010” are the attributes of the “CreditCard” class.
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1. (The MyRoot method) Below is a manual implementation of the Math.sqrt() method in Java.
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method #2, which calculates the square root of positive doubles (also works for integers).
public class SquareRoot {
public static void main(String[] args) {
}
// implement a loop of your choice here
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public static double myRoot(int number) {
double root;
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double root old;
do {
root old root;
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// Method that calculates the square root of double variables
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double root;
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