Question

Cones come in a few varieties, and we will consider the right circular cone. A cone with a circular base is a circular cone. A circular cone whose axis is perpendicular to the base is a right circular cone.

1.Create a new class called

.Include a Javadoc comment at the top of the class. The Javadoc comment should contain:

i.The name of the class and a (very) short description

ii.An @author tag followed by your name

iii.An @version tag followed by the version number.

2.Do not include a main method inside the class definition. As before, the class is not a complete program.

3.Let’s not worry about a Cone’s location in 3D space (yet!). If we ignore the right circular cone’s location, we can represent it with two variables: radius and height. Create instance variables for its radius and height.

4.A Cone has a public constructor which accepts one parameter for each of the instance variables. The body of the constructor should assign each parameter to its respective instance variable.

5.Create an accessor and a mutator for each instance variable.

6.Create a method that returns the volume of the Cone. The formula for the volume V of a cone of radius r and height h =$#휋푟!ℎ.

7.Create a method that returns the slant height of the Cone. The formula for the slant height SH of a Cone of radius r and height h =√푟!+ℎ!.

8.Create a method that returns the surface area of the Cone. The formula for the surface area A of a Cone of radius r and height h=휋푟!+휋푟(√푟!+ℎ!)9.Create a toString() method which returns a String composed of the concatenation of the information in the Cone.

Answer 1

Source code of the program and its working are given below.Comments are also given along with the code for better understanding.Screen shot of the code and output are also attached.If find any difficulty, feel free to ask in comment section. Please do upvote the answer.Thank you.

Working of the program

• In Cone class. instance variable radius and height are declared
• Constructor is defined to initialize these variables
• getter methods are defined to get values.
• setter methods are defined to set values.
• getVolume() method is defined to calculate volume of cone.
• Volume of a cone is calculated by using the formula  
• getSlantHeight() method is defined to calculate slant height of the cone.
• Slant height of a cone is calculated by using the formula   where r is the radius and h is the height
• getSurfaceArea() method is defined to calculate surface area of the cone.
• Surface area of a cone is calculated by using the formula  
• toString() method of Object class is overridden to print cone information directly
• Inside main class,an object of Cone class is created
• It's information is printed
• getVolume() ,getSlantHeight(),getSurfaceArea() methods are called and results are printed.

Source code

Cone class

/** Cone class represent right circular cone with radius and height
 * it contain methods to find volume,surface area,slant height
 * @author Your name
 * @version 1.0
 */
public class Cone {
    //instance variable declaration
    private double radius;
    private double height;
    //constructor to initialize variables
    public Cone(double radius, double height) {
        this.radius = radius;
        this.height = height;
    }
    //getter methods to get values
    public double getRadius() {
        return radius;
    }

    public double getHeight() {
        return height;
    }
    //setter methods to set values
    public void setRadius(double radius) {
        this.radius = radius;
    }

    public void setHeight(double height) {
        this.height = height;
    }
    //method to calculate volume
    public double getVolume()
    {
        double v=3.1416*radius*radius*height/3;
        return v;
    }
    //method to calculate slant height
    public double getSlantHeight()
    {
        double slantHeight=Math.sqrt(height*height+radius*radius);
        return slantHeight;
    }
    //method to calculate surface area
    public double getSurfaceArea()
    {
        double surfaceArea=3.1416*radius*(radius+Math.sqrt(height*height+radius*radius));
        return surfaceArea;
    }
    //overriding toString() method to print information of cone directly
    @Override
    public String toString() {
        return "\nRadius: "+radius+"\nHeight: "+height;
    }
}

Main class

public class Main {

    public static void main(String[] args) {
        //create Cone object
        Cone c=new Cone(8,12);
        //print cone information
        System.out.println(c);
        //display volume
        System.out.println("Volume: "+c.getVolume());
        //display slant height
        System.out.println("Slant height: "+c.getSlantHeight());
        //display surface area
        System.out.println("Surface area: "+c.getSurfaceArea());
    }
}

Screen shot of the code

Screen shot of the output