A: By using inheritance concept, create class name Circle. The class consists: Private radius instance variable getRadius () method to return redius getArea() method to return area of circle setRadius() method to set specific value to redius • toString() to print radius and area of circle. Create class Cylinder that extends class Circle contains: private height double instance variable getHeight ()method to return hight getVolume()method to return volume of cylinder hen, write a program names test to using of classes and methods above.

A: By using inheritance concept, create class name Circle. The class consists: Private radius instance variable getRadius () method to return redius getArea() method to return area of circle setRadius() method to set specific value to redius • toString() to print radius and area of circle. Create class Cylinder that extends class Circle contains: private height double instance variable getHeight ()method to return hight getVolume()method to return volume of cylinder hen, write a program names test to using of classes and methods above.

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

See similar textbooks

Similar questions

The ability to create classes with more specific attributes and methods that share the properties and methods of existing classes is referred to as: Abstraction Polymorphism Typecasting Inheritance
The ability to construct classes with more specific characteristics that share the properties and methods of existing classes is known as: Abstraction Polymorphism Inheritance of Typecasting
1 using static System.Console; 2 class ShapesDemo 3 { static void Main() { abstract class GeometricFigure Create an application named ShapesDemo that 4 creates several objects 5 that descend from an abstract class called 7 { GeometricFigure . Each 8 public int Height { 10 11 9 GeometricFigure get includes a height , a { 12 13 width , and an area. return height; } 14 15 Provide get and set set { 16 17 accessors for each field height = value; except area ; the area } 18 is computed and is read- } only. Include an abstract 19 public int Width 20 { 21 22 method called get ComputeArea() that { computes the area of the 23 24 return width; GeometricFigure . 25 26 27 28 29 set Next you will create three { width = value; additional classes derived from the } 30 } 31 GeometricFigure class. Name these derived classes: Rectange , 32 public int Area 33 { 34 Square , and Triangle. get 35 { 36 37 return area; } 38 } 39 40 private void CalArea() 41 { 42 43 } 44 area = Height * Width; 45 } 46
True or False ___(1) An abstract class can have fields. ___(2) You can create an object from an abstract class _ _(3) An abstract class can have both abstract methods and methods that have method body
Code the StudentAccount class according to the class diagramMethods explanation:pay(double): doubleThis method is called when a student pays an amount towards outstanding fees. The balance isreduced by the amount received. The updated balance is returned by the method.addFees(double): doubleThis method is called to increase the balance by the amount received as a parameter. The updatedbalance is returned by the method.refund(): voidThis method is called when any monies owned to the student is paid out. This method can onlyrefund a student if the balance is negative. It displays the amount to be refunded and set thebalance to zero. (Use Math.abs(double) in your output message). If there is no refund, display anappropriate message.Test your StudentAccount class by creating objects and calling the methods addFees(), pay() andrefund(). Use toString() to display the object’s data after each method called
True or false: Just as a class can have multiple constructors, it can also have multiple destructors.
:Single inheritance means one class inheriting from one super classes more classes inheriting from one super class more classes inheriting from more super classes None of the above
The properties of a child class are inherited by the parent class. Select one: True False
Polymorphism : Write a driver program that uses a AECar reference variable to point to three different types of classes, showing that inheritance is one mechanism for using polymorphism.
___________ is an Object-Oriented programming feature that allows you to define new classes from existing classes. 1 Overriding 2 Overloading 3 Inheritance 4 Polymorphism
Design/code/test a Java program containing an abstract the class absWelcome. This class should contain: 1. A public abstract void method (you name it) that is empty 2. A public regular method (you name it) that prints "Welcome to " Next, create a subclass clsHello that extends absWelcome. This class should contain: • A public regular method (you name it) that prints "Java Programming" Finally, inside the Main class create an object (you name it) from the clsHello class. Use this new object reference to: 1. Output "Welcome to " from the abstract class 2. Output "Java Programming" from the subclass Your output should resemble that shown below >sh -c javac -classpath -type f-name '*.java') java -classpath :targe Welcome to Java Programming