EBK JAVA PROGRAMMING
9th Edition
ISBN: 9781337671385
Author: FARRELL
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Polymorphism
Create a class hierarchy that represents different types of employees in a company. Start with a class called Employee that has two methods: calculateSalary() and displayDetails().
Then, create two subclasses of Employee: Manager and Engineer. Override the calculateSalary() method in both subclasses to calculate the salary based on their job role and experience. Override the displayDetails() method in both subclasses to print out a message indicating the details of the employee.
Next, create another class called Salesperson that extends Employee and has a method called calculateCommission().
Create two subclasses of Salesperson: SeniorSalesperson and JuniorSalesperson. Override the calculateCommission() method in both subclasses to calculate the commission based on their sales performance. Override the displayDetails() method in both subclasses to print out a message indicating the details of the salesperson.
In the main method, create objects of each class and call their…
Inheritance is an OOP concept such that a class can be defined in
different ways, such as either being typecasted to itself (as a
subclass) or any of its superclasses.
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- True/False 7. A superclass inherits behaviors from its subclasses.arrow_forwardQUESTION 2 A protected member of a class may be directly accessed by methods of the same class methods of a subclass methods in the same package Any of these QUESTION 3 A subclass can directly access only public and private members of the superclass all members of the superclass only protected and private members of the superclass only public and protected members of the superclassarrow_forwardJava - If the programmer doesn't declare any constructors for an extended class, what constructors will be inherited from the superclass? How does this inherited constructor initialize new instance variables that are not part of the superclass?arrow_forward
- True or False A subclass can have more fields and methods than its superclass.arrow_forward1. Create an interface OnlineQuiz with the following details: Member variables: totalMarks=10 Member Methods: · nQuestions(): An abstract method that calculates and return the number of questions. Defined in subclass. · display(): An abstract method that displays all details. Defined in a subclass. 2. Create a class Staff that inherits OnlineQuiz with the following details: Member variables: · staffD // id of the staff string type · staffName // Name of the staff string type · nMCQ // Number of MCQ type questions int type · nTF // Number of true/false type questions int type · nMatch // Number of match type questions int type Member Methods: · Define the parameterized constructor to set the member variables. · Define the method nQuestions(): which calculate and return the total number of questions. Total number of question= nMCQ + nTF +…arrow_forwardDraw the follClass Structure: 1. NotificationSystem: This is the main class that manages the notification system. It has the following attributes and methods: - Attributes: - users: a list of User objects representing all the users registered in the system - tweets: a list of Tweet objects representing all the tweets posted in the system - Methods: - register_user(user): adds a new user to the system - post_tweet(user, message): posts a new tweet on behalf of a user - get_timeline(user): returns a list of tweets from all users that the specified user follows - get_mentions(user): returns a list of tweets that mention the specified user 2. User: This class represents a user in the system. It has the following attributes and methods: - Attributes: - username: a string representing the username of the user - followers: a list of User objects representing all users who follow this user - following: a list of User objects representing all users whom this user follows -…arrow_forward
- True or false? A subclass is a subset of a superclass.arrow_forwardCreate an Employee Class with the ff: attributes: = String name = double salary = String birthday = __init__(self, name, salary, birthday) = String getDetails() -- returns a String value that represents all the information of the Employee object Create a Manager class that inherits Employee, a Manager will also have the ff: = String department = __init__(self, name, salary, birthday, department) = String getDetails() -- returns a String value that represents all the information of the Manager object Create a Director class that inherits Manager, a Director will also have the ff: = double carAllowance = __init__(self, name, salary, birthday, department, carAllowance) = def playGolf() -- will print a string value '{name of director} plays golf' = String getDetails() -- returns a String value that represents all the information of the Director object Create 2 objects of each class and call their respective getDetails() method. Do not write WET codes, be sure there's no…arrow_forwardWhat is inherited in a subclass from its superclass? O class members O constructors class members and constructors O private methods O attributes and constructors O None of the above.arrow_forward
- variables are variables that have the same name as variables that have been declared in a superclass and are declared in a subclass, respectively.arrow_forwardObject-Oriented Programming Create a Java program that has the following: Inheritance - Create a superclass and one or more subclasses that inherit properties and methods from the superclass. Polymorphism - Show polymorphism by using method overriding and method overloading. Provide an example of runtime polymorphism by creating objects of the subclasses and calling overridden methods. Encapsulation - Demonstrate the concept of encapsulation by applying access modifiers (private, protected, public) appropriately in your program. Abstraction - Utilize abstract classes and methods in your program to illustrate abstraction. Show examples of the following words: super, this, static, final (NO USE OF AI)arrow_forwardIf Class A inherits from Class B, we say that Class B is the subclass and Class A is the superclass. True Falsearrow_forward
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