Modified Circle class and test file:Add a new attribute for color (or any other new attribute)Add get/set methods for this new instance variable, including data validation in set method (assuming background is black, i.e. circle color can't be black, reset to any non-black color if black is entered ).Add a new constructor to pass the color attribute as an argument.Add an instance method to display all properties of a Circle object.Create 2 objects using different constructors in test file, with invalid data. Use this test java filetest java file:class CircleTest{ public static void main(String[] args){ int num = 10; Circle c1 = new Circle(0.001); Circle c2 = new Circle("black", -9); c1.display(); c2.display(); c1.setRadius( -1); c1.setColor("black"); c1.display(); }}

Solution: Given, class CircleTest{ public static void main(String[] args){ int num = 10; Circle c1 = new Circle(0.001); Circle c2 = new Circle("black", -9); c1.display(); c2.display(); c1.setRadius( -1); c1.setColor("black"); c1.display(); }}Circle.java class Circle{ String color; double radius; public Circle(double radius) { if(radius<=0) { System.out.println("Radius can not be less than or equals to 0."); } else{ this.radius = radius; } } public Circle(String color, double radius) { if(radius<=0 ) { System.out.println("Radius can not be less than or equals to 0."); } else if(color.equals("black")) { this.color = "Green"; this.radius = radius; } else{ this.color = color; this.radius = radius; } } //getter and setters public void setColor(String color) { if(color.equals("black")) this.color = "red"; else this.color = color; } public void setRadius(double radius) { if(radius<=0) { System.out.println("Radius must be greater 0."); } else this.radius = radius; } public String getColor(){ return color; } public double getRadius() { return radius; } public void display() { System.out.println("Circle Radius = "+radius); System.out.println("Circle color = "+color); } } CircleTest.java public class CircleTest{ public static void main(String[] args){ int num = 10; Circle c1 = new Circle(0.001); Circle c2 = new Circle("black", -9); c1.display(); c2.display(); c1.setRadius( -1); c1.setColor("black"); c1.display(); }}Output Screenshot:

Answered: Modified Circle class and test file:…

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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Modified Circle class and test file:

Add a new attribute for color (or any other new attribute)
Add get/set methods for this new instance variable, including data validation in set method (assuming background is black, i.e. circle color can't be black, reset to any non-black color if black is entered ).
Add a new constructor to pass the color attribute as an argument.
Add an instance method to display all properties of a Circle object.
Create 2 objects using different constructors in test file, with invalid data. Use this test java file

test java file:

class CircleTest{
public static void main(String[] args){
int num = 10;
Circle c1 = new Circle(0.001);
Circle c2 = new Circle("black", -9);

c1.display();
c2.display();

c1.setRadius( -1);
c1.setColor("black");
c1.display();
}
}

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