Question

This must be done in Java and it must contain a public static void (string []args)

10.13 (Project: Shape Hierarchy) Implement the Shape hierarchy shown in Fig. 9.3.  Each TwoDimensionalShape should contain method getArea to calculate the area of the two-dimensional shape. Each ThreeDimensionalShape should have methods getArea and getVolume to calculate the surface area and volume, respectively, of the three-dimensional shape.  Create a program that uses an array of Shape references to objects of each concrete class in the hierarchy.  The program should print a text description of the object to which each array element refers.  Also, in the loop that processes all the shapes in the array, determine whether each shape is a TwoDimensionalShape or a ThreeDimensionalShape.  If it’s a TwoDimensionalShape, display its area.  If it’s a ThreeDimensionalShape, display its area and volume.

page 439

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You

====================================

// Shape.java

public class Shape {
   //Declaring instance variables
   private String name;

   //Parameterized constructor
   public Shape(String name) {
   this.name = name;
   }
   //getters and setters
   public String getName() {
   return name;
   }

   public void setName(String name) {
   this.name = name;
   }

   //toString method is used to display the contents of an object inside it
   @Override
   public String toString() {
   return "Shape is "+name;
   }
  
   }

====================================

// TwoDimensionalShape.java

public abstract class TwoDimensionalShape extends Shape {

public TwoDimensionalShape(String name) {

super(name);

}

public abstract double getArea();

public abstract double getPerimeter();

}

====================================

// Circle.java

public class Circle extends TwoDimensionalShape {

//Declaring instance variables

private double radius;

//Parameterized constructor

public Circle(String name, double radius) {

super(name);

this.radius = radius;

}

//This method will calculate the area of the Circle

@Override

public double getArea() {

return Math.PI*radius*radius;

}

//This method will calculate the perimeter of the Circle

@Override

public double getPerimeter() {

return 2*Math.PI*radius;

}

}

====================================

// ThreeDimensionalShape.java

public abstract class ThreeDimensionalShape extends Shape {

public ThreeDimensionalShape(String name) {

super(name);

}

public abstract double getArea();

public abstract double getVolume();

}

====================================

// Cube.java

public class Cube extends ThreeDimensionalShape {

//Declaring instance variables

private double side;

//Parameterized constructor

public Cube(String name, double side) {

super(name);

this.side = side;

}

//This method will calculate the area of the Cube

@Override

public double getArea() {

return 6*side*side;

}

//This method will calculate the volume of the Cube

@Override

public double getVolume() {

return Math.pow(side,3);

}

}

====================================

// Sphere.java

public class Sphere extends ThreeDimensionalShape {

//Declaring instance variables

private double raidus;

//Parameterized constructor

public Sphere(String name, double raidus) {

super(name);

this.raidus = raidus;

}

//This method will calculate the area of the Sphere

@Override

public double getArea() {

return 4*Math.PI*raidus*raidus;

}

//This method will calculate the volume of the Sphere

@Override

public double getVolume() {

return (4.0/3.0)*Math.PI*Math.pow(raidus,3);

}

}

====================================

// Rectangle.java

public class Rectangle extends TwoDimensionalShape {

   private double width;
   private double height;
  
  
   public Rectangle(String name, double width, double height) {
       super(name);
       this.width = width;
       this.height = height;
   }

   @Override
   public double getArea() {
      
       return width*height;
   }

   @Override
   public double getPerimeter() {
      
       return 2*(width+height);
   }

}

====================================

// Test.java

public class Test {

public static void main(String[] args) {

Shape s[]={
new Circle("Circle",5.5),
new Rectangle("Rectangle",5,7),
new Sphere("Sphere",4.5),
new Cube("Cube",3)
};
for(int i=0;i<s.length;i++)
{
if(s[i] instanceof TwoDimensionalShape)
{
System.out.println("___"+s[i].getName()+"___");
System.out.printf("Area :%.2f\n",((TwoDimensionalShape)s[i]).getArea());
}
else if(s[i] instanceof ThreeDimensionalShape)
{
System.out.println("___"+s[i].getName()+"___");
System.out.printf("Area :%.2f\n",((ThreeDimensionalShape)s[i]).getArea());
System.out.printf("Volume :%.2f\n",((ThreeDimensionalShape)s[i]).getVolume());
}
}

}

}

====================================

Output:

___Circle___
Area :95.03
___Rectangle___
Area :35.00
___Sphere___
Area :254.47
Volume :381.70
___Cube___
Area :54.00
Volume :27.00

=======================Could you plz rate me well.Thank You