Question

In Java

Create an interface called Amount that includes a method called setPricel) Create an abstract class named Book that inherits from the interface Amount. Include a String field for the book's title and a double field for the book's Price. Within the class, include a constructor that requires the book title and add two getter methods-one that returns the title and one that returns the price. Include an abstract method named setPrice() Create a child class of Book: NonFiction. Must include a setPrice() method that sets the price for all NonFiction Books to $37.99. Should also include a constructor. Create a child class of Book: Fiction (Make the class final). Must include a setPrice() method that sets the price for all Fiction Books to $ 24.99. Should also include a constructor. Also include a ratings field that can be assigned to either G, PG, R, NR. Create another child class that inherits from NonFiction called Adults. Include a setPrice() method that sets the price to $50.00. Also include a field called level which can be assigned to painful, dull, interesting and exciting. Also include a constructor Create a Driver class that creates an array of objects for all the classes (Only the ones that are possible) and display their fields.

Create an interface called

Amount

that includes a method called

setPrice

().

Create an abstract class named

Book

that inherits from the interface Amount. Include a String field for

the book’s

title

and a double field for the book’s

Price

. Within the class, include a constructor that

requires the book title and add

two getter methods

— one that returns the title and one that returns the

price. Include an abstract method named

setPrice

().

Create a child class of Book:

NonFiction

. Must include a

setPrice

() method that sets the price for all

NonFiction Books to $37.99. Should also include a

constructor

.

Create a child class of Book:

Fiction

(Make the class

final

). Must include a

setPrice

() method that sets the

price for all Fiction Books to $ 24.99. Should also include a

constructor

. Also include a

ratings

field that

can be assigned to either G, PG, R, NR.

Create another child class that inherits from NonFiction called

Adults

. Include a

setPrice

() method that

sets the price to $50.00. Also include a field called

level

which can be assigned to painful, dull,

interesting and exciting. Also include a

constructor

Create a

Driver

class that creates an array of objects for all the classes (Only the ones that are possible)

and display their fields.

Thank you :)

Answer 1

Amount.java

/** interface called Amount that includes a method called
* setPrice()
*/

public interface Amount
{
void setPrice();
}
========================================================================================

Book.java

/** an abstract class named Book that inherits from the interface Amount.
* Include a String field for
* the book’s title and a double field for the book’s Price
*/

public abstract class Book implements Amount
{
/** Member variables */
String bookTitle;
double bookPrice;

/** Constructor that requires the book title */
public Book(String title)
{
bookTitle = title;
}
  
/** getter methods */
public String getTitle()
{
return bookTitle;
}
  
public double getPrice()
{
return bookPrice;
}
  
/** abstract method named setPrice() */
public abstract void setPrice();
}

NonFiction.java

/** NonFiction is the subclass that inherits Book */
public class NonFiction extends Book
{
public NonFiction(String title)
{
/** calling the superclass constructor */
super(title);
}
  
public void setPrice()
{
bookPrice = 37.99;
}
}

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

Fiction.java

/** Fiction is a final class which inherits from Book */
public final class Fiction extends Book
{
/** Member variable */
String ratings;
  
public Fiction(String title, String r)
{
/** calling super class constructor */
super(title);
ratings = r;
}
  
/** override setPrice method */
public void setPrice()
{
bookPrice = 24.99;
}
}

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

Adults.java

/** Adults is a subclass of NonFiction */
public class Adults extends NonFiction
{
/** Member variable */
String level;
  
/** Constructor */
public Adults(String title,String l)
{
super(title);
level = l;
}
  
/** Overridden setPrice() method */
public void setPrice()
{
bookPrice = 50.00;
}
}

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

Driver.java

public class Driver
{
public static void main(String[] s)
{
/** Cannot create object for an interface Amount */
/** Cannot create object for an abstract class */
  
Object object[] = new Object[10];
  
NonFiction nf = new NonFiction("Title1");
nf.setPrice();
System.out.println("Book Title :: " + nf.getTitle());
System.out.println("Book Price :: $" + nf.getPrice());
System.out.println();
object[0] = nf;
  
Fiction f = new Fiction("Title2","PG");
f.setPrice();
System.out.println("Book Title :: " + f.getTitle());
System.out.println("Ratings :: " + f.ratings);
System.out.println("Book Price :: $" + f.getPrice());
System.out.println();
object[1] = f;
  
Adults a = new Adults("Title3","dull");
a.setPrice();
System.out.println("Book Title :: " + a.getTitle());
System.out.println("Level :: " + a.level);
System.out.println("Book Price :: $" + a.getPrice());
System.out.println();
object[2] = a;
}
  
}

Sample output: