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

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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
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