10A class has to necessarily be declared as abstract class ifO A class overrides a method from super class.O A class inherits from an abstract class.O A class does not implements all the methods declared abstract in the super classA class implements more than one interface.Activate WGo to Setting1136°C HazeA 4)O10

Answered: 10 A class has to necessarily be…

Engineering

Computer Science

10 A class has to necessarily be declared as abstract class if

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 7RQ

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Create an abstract class named Course that can be used with course allocation mechanism of an enterprise. The Course class should track the course Id Number, course Title and course Credit Hours with appropriate accessor/getter and mutator/setter methods. Define an equals (Course obj) method, that returns true if caller and input argument course object have identical course Id Number. Also define an abstract method double getCourseEnrollmentFee(). Next, create two additional classes named ElectiveCourse and CoreCourse that are derived from Course. Finally, create an overridden method named getCourseEnrollmentFee() calculate and returns the total fee for that course. Elective course has Rs. 10,000 per credit hours and Core has Rs. 13,000 per credit hours.
Write an abstract superclass encapsulating a student. Thisabstract superclass named Student has two data fields:student’s ID and annual tuition. This abstract class has twononabstract subclasses: one encapsulating undergraduatestudents named Undergraduateclass, and the otherencapsulating graduate students named Graduate. Thisabstract superclass also has a getTuition() method and asetTuition(int tuition) method. The setTuition(int tuition) is onlyan abstract method. In Java The Undergraduate class has two additional data fields: nameand GPA. This class has also its own setTuition(int tuition)method .The Graduate class has one additional attribute:major. It also has its own setTuition(int tuition) method. You also need to include a class to test these two classes.Create an object from each subclass and call a method if anysubclass has it. Each class should have its own constructor and String toString()method.
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Create a project Vehicles in bluej. The project has Cars, Buses ,Trucks and Bikesclasses ,all these classes inherit from an interface Vehicle. Pedal_bikesand Motor_bikesare subclasses of abstract class Bikes. A.Show the relationship(class diagrams)between above mentioned classesand interfacesand write the necessary class definitions. B.Interface should have 3 methods: drive(), start() and stop(). C.abstract class Bikesshould have 2abstract methods: speed( ) and getModel( ). D.Which one of the following assignments are legal, why or why not? Justify. Pedal_bikes bik= new Motor_bikes( ); Vehiclev1 = new Buses (); Bikesbi= new Bikes( ) please use BlueJ program.
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