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How do you this? This program builds on the previous assignment. A typical cylin

ID: 3798881 • Letter: H

Question

How do you this?

This program builds on the previous assignment. A typical cylinder is built on the basis of a circle. In your last assignment you created a class Circle. Your task for this assignment is to use the idea of Aggregation to build a class called Cylinder. The private members of the Cylinder should be a Circle object as well as a doublevariable for the height.

Create appropriate constructors for the Cylinder class including a copy constructor. You may also want to create a copy constructor for the Circle class as well.

Along with the appropriate getters and setters, create methods that determine the area of a cylinder (using methods that the Circle object has already provided), and the volume of a cylinder.

Explanation / Answer

import java.util.*;
import java.lang.*;
import java.io.*;

public class Circle
{
    private double radius;

    public Circle() //default constructor
    {
        radius = 0.0;
    }
    public Circle(double radius) //parameterized constructor
    {
        this.radius = radius;
    }
    public Circle(Circle c) //copy constructor
    {
        radius = c.radius;
    }
    public double getRadius()
    {
        return radius;
    }
    public double area() //compute area
    {
        return 3.14*radius*radius;
    }
}
public class Cylinder
{
private Circle cir;   //circle class object aggregation
private double height;

public Cylinder() //default constructor
{

    height = 0.0;
}
public Cylinder(Circle cir1,double height) //parameterized constructor
{
    cir = cir1;           // using copy constructor of Circle
    this.height = height;
}
public Cylinder(Cylinder c) //copy constructor
{
    height = c.height;


}
public double area()   //compute area of cylinder
{
    return (2*3.14*cir.getRadius()*height + 2*cir.area());
}

}
public class TestCylinder
{
   public static void main (String[] args)
   {
       Circle circle1 = new Circle(4.4);
    System.out.println("Area of circle : "+circle1.area());

   Cylinder cylinder1 = new Cylinder(circle1,6.7);
   System.out.println(" Area of cylinder : "+cylinder1.area());
   }
}

Output:

Area of circle : 60.7904

Area of cylinder : 306.715

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