Question

Write a Java program with the following requirements:

Rectangle that implements Shape2D
- instance variables height, width

Block that implements Shape3D
- instance variables height, width, depth

Add appropriate parameterized constructors for each class.
Implement the abstract methods to make each class a Shape2D, Shape3D, or both.

Make the main method use each of these to print out the area of a rectangle, and the
area and volume of a block.

Answer 1

abstract class Shape

{

abstract void Shapes();

Shape()

{

System.out.println("Inside cosntructor of class Shape");

}

}

class Rectangle extends Shape

{

int height,width;

Rectangle(int h,int w)

{

System.out.println("Inside comstructor of class Rectangle");

height=h;

width=w;

}

void Shapes()

{

System.out.println("This is a 2D Shape ");

}

void Shape2D()

{

System.out.println("Area of 2D shape is "+(height*width));

}

}

class Block extends Shape

{

int height,width,depth;

void Shapes(){

System.out.println("This is a 3d Shape ");}

Block(int h,int w,int d)

{

height=h;width=w;depth=d;

System.out.println("Inside constructor of class Block");

}

void Shape3D()

{

System.out.println("Area of 3D shape is "+(height*width*depth));

}

}

public class Main {

public static void main(String[] args) {

Rectangle r=new Rectangle(10,5);

r.Shape2D();

Block b=new Block(10,5,2);

b.Shape3D();

}

}

Main.java* 1 abstract class Shape 2 { abstract void Shapes(); Shape() { System.out.println("Inside cosntructor of class Shape"); } 8 } 9 class Rectangle extends Shape 10 { 4 int height,width; Rectangle(int h,int w) 11 12 13 System.out.println("Inside comstructor of class Rectangle"); height=h; width=w; } void Shapes() { System.out.printIn("This is a 2D Shape "); 14 15 16 17 18 19 20 21 void Shape2D0 { System.out.println("Area of 2D shape is "+ (height*width)); 22 23 24 25 26 27 } 28 class Block extends Shape 29 { int height,width,depth; void Shapes(){ System.out.println("This is a 3d S" Block(int h,int w,int d) 30 ");} 32 33 Tab II

Main.java* 19 System.out.printIn("This is a 2D Shape "); } void Shape2D() { System.out.println("Area of 2D shape is "+ (height*width)); } 20 21 22 23 24 25 26 27 } 28 class Block extends Shape 29 { 30 int height,width,depth; void Shapes(){ System.out.println("This is a 3d Shape ");} Block(int h,int w,int d) 31 32 33 34 35 height=h;width=w;depth=Dd; System.out.println("Inside constructor of class Block"); } void Shape3D() 36 37 38 39 System.out.printIn("Area of 3D shape is "+ (height*width*depth)); 40 } 41 } 42 43 44 45 46 public class Main { 47 public static void main(String] args) { Rectangle r=new Rectangle(10,5); r.Shape2D(); Block b=new Block(10,5,2); b.Shape3D() 48 49 50 51 52 Tab

TAB Inside cosntructor of class Shape Inside comstructor of class Rectangle Area of 2D shape is 50 Inside cosntructor of class Shape Inside constructor of class Block Area of 3D shape is 100 [Program finished]
Please upvote... Thanks