Question

PLEASE HELP this is the last part of my lab and I need help ):

add comments please (: if it is too difficult you do not have to do part 3 but it would be greatly appreciated if you do !

Obtain example code files Circle.java, Shape.java, CircleShape2.java, Sphere.java, and CircleShapeApp.java from the downloaded files in Ch8. Compile and execute the example and understand the polymorphism it performs. (I have copied and pasted all of these files below) Modify the application as follows:

1. Code a class called Cone inherited from class Circle. Cone will override the computeArea() and computeVolume() methods from its superclass to calculate the area and volume of a Cone object. Must apply code-reusability in the calculation formula.

2. Modify the driver code, CircleShapeApp.java, so it will also create an object of Cone with a height of 12.5 and diameter of 10.48. Modify the polymorphic calls to calculate and display the result of the calculations.

3. Instead of hard-coded data, modify your application to be interactive using JOptionPane, thus it will ask user to enter proper data for different object, continue to utilize the Validator class you have developed before to validate all wrong data entries, including negative and non-numerical data. Your program must continue to run until the user enters “n” to terminate the execution. You must also validate the user's entry so that only “y” and “n” are accepted.

----- Circle.java -----

//subclass class Circle

public class Circle extends CircleShape2{
   protected double area;
   protected double volume;

   public Circle() {
       super();           //call super class non-argument constructor
       area = 0;
       volume = 0;
   }
   public Circle(double radius) {
       super(radius);       //call super class one-argument constructor
   }
   public Circle(double x1, double y1, double x2, double y2) {
       super(x1, y1, x2, y2);//call super class four-argument constructor
   }

   public void computeArea() {
       area = Math.PI * radius * radius;
   }

   public double getArea() {
       return area;
   }

   public void computeVolume() {}                    //must implement
  
   public double getVolume() {
       return volume;
   }
   public String toString() {                   //override the toString() method
       return super.toString() + "Area: " + area + "\n";
    }

}

----- Shape.java -----

//abstract class Shape

public abstract class Shape {
   protected double x1, y1, x2, y2;
   public Shape() {
       x1 = y1 = x2 = y2 = 0.0;
   }
   public Shape(double x1, double y1, double x2, double y2) {
           this.x1 = x1;
           this.y1 = y1;
           this.x2 = x2;
           this.y2 = y2;
       }

   public String toString() {
       String message = "(" + x1 + "," + y1 + "), ("
              + x2 + "," + y2 + ")\n";
       return message;
       }

   public abstract void computeArea();       //¶¨Òå³éÏó·½·¨
   public abstract void computeVolume();
   public abstract double getArea();
   public abstract double getVolume();
}

----- CircleShape2 -----

//abstract class CircleShape2

public abstract class CircleShape2 extends Shape {       //Inheritance
   protected double radius;

public CircleShape2() {
   x1 = y1 = x2 = y2 = 0.0;
   }
public CircleShape2(double x1, double y1, double x2, double y2) {
       super(x1, y1, x2, y2);       //Call constructor of Shape
   }
public CircleShape2(double radius) {
      this.radius = radius;
   }
   public void setRadius(double radius) {
       this.radius = radius;
   }
   public double getRadius() {
       return radius;
   }
   public void computeRadius() {
       radius = Math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2) * (y1 - y2));
   }
   public String toString() {
       return super.toString() + "Radius: " + radius + "\n";
   }
}

----- Sphere.java -----

//subclass class Sphere inherites Circle

class Sphere extends Circle{
   public Sphere() {
       super();           //call super class non-argument constructor
   }
   public Sphere(double radius) {
       super(radius);       //call super class one-argument constructor
   }
   public Sphere(double x1, double y1, double x2, double y2) {
       super(x1, y1, x2, y2);//call super class four-argument constructor
   }

   public void computeArea() {       //compute sphere's area
       super.computeArea();       //call super class' method
       area = 4* area;
   }

   public void computeVolume() {   //compute sphere's valume
       super.computeArea();
       volume = 4.0/3 * radius * area;
   }
}

----- CircleShapeApp.java -----

//the driver class for circle shapes

public class CircleShapeApp{

   public static void main(String[] args) {
        Circle circle = new Circle(12.98);
        Sphere sphere = new Sphere(25.55);

        Shape shape = circle;

        shape.computeArea();
        System.out.println("circle area: " + shape.getArea());
        shape.computeVolume();
        System.out.println("circle volume: " + shape.getVolume());

       shape = sphere;
        shape.computeArea();
        System.out.println("Sphere area: " + shape.getArea());
        shape.computeVolume();
        System.out.println("Sphere volume: " + shape.getVolume());
    }

}

Answer 1

//the driver class for circle shapes

//I have made the following changes to the code

//Output Screen attached

--------CircleShapeApp--------

public class CircleShapeApp{

public static void main(String[] args) {
Circle circle = new Circle(12.98);
Sphere sphere = new Sphere(25.55);
Cone cone=new Cone(12.5,10.48); //Creating Cone object as given in question
Shape shape = circle;
shape.computeArea();
System.out.println("circle area: " + shape.getArea());
shape.computeVolume();
System.out.println("circle volume: " + shape.getVolume());

shape = sphere;
shape.computeArea();
System.out.println("Sphere area: " + shape.getArea());
shape.computeVolume();
System.out.println("Sphere volume: " + shape.getVolume());

shape=cone; //following same format
shape.computeArea();
System.out.println("Cone area: " + shape.getArea());
shape.computeVolume();
System.out.println("Cone volume: " + shape.getVolume());
  
}

}

----------Cone.java--------

public class Cone extends Circle{
   double l,diameter,height;
  
   public Cone(double diameter,double height){
       this.diameter=diameter;
       this.height=height;
      
      
   }
   public void computeArea() {
       radius=diameter/2;
       l=Math.sqrt(height*height+radius*radius); //l is slant height which is required for surface area.
   area = Math.PI * radius * radius+Math.PI*radius*l; // calculation reusability will increase complexity by creation of //extra circle object.
   }
   public void computeVolume(){
       volume=Math.PI*radius*radius*1/3;
   }
     
}
----shape.java------

public abstract class Shape {
protected double x1, y1, x2, y2;
public Shape() {
x1 = y1 = x2 = y2 = 0.0;
}
public Shape(double x1, double y1, double x2, double y2) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
}

public String toString() {
String message = "(" + x1 + "," + y1 + "), ("
+ x2 + "," + y2 + ")\n";
return message;
}

public abstract void computeArea(); //¶¨Òå³éÏó·½·¨
public abstract void computeVolume();
public abstract double getArea();
public abstract double getVolume();
}

-------CircleShape2.java-----

//abstract class CircleShape2

public abstract class CircleShape2 extends Shape { //Inheritance
protected double radius;

public CircleShape2() {
x1 = y1 = x2 = y2 = 0.0;
}
public CircleShape2(double x1, double y1, double x2, double y2) {
super(x1, y1, x2, y2); //Call constructor of Shape
}
public CircleShape2(double radius) {
this.radius = radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
public double getRadius() {
return radius;
}
public void computeRadius() {
radius = Math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2) * (y1 - y2));
}
public String toString() {
return super.toString() + "Radius: " + radius + "\n";
}
}
--------Sphere.java-------

class Sphere extends Circle{
public Sphere() {
super(); //call super class non-argument constructor
}
public Sphere(double radius) {
super(radius); //call super class one-argument constructor
}
public Sphere(double x1, double y1, double x2, double y2) {
super(x1, y1, x2, y2);//call super class four-argument constructor
}

public void computeArea() { //compute sphere's area
super.computeArea(); //call super class' method
area = 4* area;
}

public void computeVolume() { //compute sphere's valume
super.computeArea();
volume = 4.0/3 * radius * area;
}
}

-----Circle.java------

public class Circle extends CircleShape2{
protected double area;
protected double volume;

public Circle() {
super(); //call super class non-argument constructor
area = 0;
volume = 0;
}
public Circle(double radius) {
super(radius); //call super class one-argument constructor
}
public Circle(double x1, double y1, double x2, double y2) {
super(x1, y1, x2, y2);//call super class four-argument constructor
}

public void computeArea() {
area = Math.PI * radius * radius;
}

public double getArea() {
return area;
}

public void computeVolume() {} //must implement
  
public double getVolume() {
return volume;
}
public String toString() { //override the toString() method
return super.toString() + "Area: " + area + "\n";
}

}

-------output Screen-------

Problems @ JavadocDeclaration E Console Servers cterminated> CircleShapeApp [lava Application] CAProgram FilesJavaljdk1.8.0_171\binjavaw.exe (Mar 31, 2019 12:35:09 PM circle area 529.2967869138698 circle volume: 0.0 Sphere area: 8203.358152980205 Sphere volume: 69865.26693621474 Cone area: 362.30746830953274 Cone volume: 40.9061543436171

As Circle has no volume it is 2D Structure.

//Thanks