Question

1- Create the base class Book that has the following instance variables, constructor, and methods

title ( String)

isbn ( String)

authors (String)

publisher (String)

edition ( int)

published_year (int)

Constructor that takes all of the above variables as input parameters.

set/get methods

ToString method // that return sting representation of Book object.

2- Create the sub class New_Book that is derived from the base class Book and has the following instance variables, constructor, and methods:

title ( String)

isbn ( String)

authors (String)

publisher (String)

edition ( int)

published_year (int)

price (double)

Constructor that takes all of the above variables as input parameters.

set/get methods

calculate_price // returns the price of the book as listed in the price variable.

ToString method // that return sting representation of New_Book object.

3- Create the sub class Used_Book that is derived from the base class Book and has the following instance variables

title ( String)

isbn ( String)

authors (String)

publisher (String)

edition ( int)

published_year (int)

price_new (double) // the price of the book if it is new

age (int) // how old the book is in years

Constructor that takes all of the above variables as input parameters.

set/get methods

calculate_price method // the price is calculated as price_new * (1- 0.15*age)

ToString method

4- Create the Testing class that has the main method and does the following:

     a- Use the constructor to create object of New_Book class named newbook (you can choose the values of input parameters of the constructor). Call compute_price method.

     b- Use the constructor to create object of Used_Book class named usedbook (you can choose the values of input parameters of the constructor).. Call compute_price method.

     c- Print out the related information of newbook and usedbook objects.

Answer 1

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

_________________

// Book.java

public class Book {
   private String title;
   private String isbn;
   private String authors;
   private int edition;
   private int published_year;

   public Book(String title, String isbn, String authors, int edition,
           int published_year) {
       this.title = title;
       this.isbn = isbn;
       this.authors = authors;
       this.edition = edition;
       this.published_year = published_year;
   }

   public String getTitle() {
       return title;
   }

   public void setTitle(String title) {
       this.title = title;
   }

   public String getIsbn() {
       return isbn;
   }

   public void setIsbn(String isbn) {
       this.isbn = isbn;
   }

   public String getAuthors() {
       return authors;
   }

   public void setAuthors(String authors) {
       this.authors = authors;
   }

   public int getEdition() {
       return edition;
   }

   public void setEdition(int edition) {
       this.edition = edition;
   }

   public int getPublished_year() {
       return published_year;
   }

   public void setPublished_year(int published_year) {
       this.published_year = published_year;
   }

   @Override
   public String toString() {
       return " Title=" + title + ", ISBN=" + isbn + ", authors="
               + authors + ", Edition=" + edition + ", Published_year="
               + published_year;
   }

}
_________________________

// New_Book.java

public class New_Book extends Book {
   private double price;

   public New_Book(String title, String isbn, String authors, int edition,
           int published_year, double price) {
       super(title, isbn, authors, edition, published_year);
       this.price = price;
   }

   public double calculate_price() {
       return price;
   }

   public void setPrice(double price) {
       this.price = price;
   }

   @Override
   public String toString() {
       return "New_Book : Price=" + price +super.toString();
   }

}
_____________________________

// Used_Book.java

public class Used_Book extends Book {
private double price_new;
private int age;
public Used_Book(String title, String isbn, String authors, int edition,
       int published_year, double price_new, int age) {
   super(title, isbn, authors, edition, published_year);
   this.price_new = price_new;
   this.age = age;
}
public double getPrice_new() {
   return price_new;
}
public void setPrice_new(double price_new) {
   this.price_new = price_new;
}
public int getAge() {
   return age;
}
public void setAge(int age) {
   this.age = age;
}
private double calculate_price()
{
   return price_new * (1- 0.15*age);
}
@Override
public String toString() {
   return "Used_Book : Price_new=" + calculate_price() + ", Age=" + age +super.toString();
}

}
______________________________

// Test.java

public class Test {

   public static void main(String[] args) {
New_Book nb=new New_Book("Wings of Fire","978-3-16-148410-0","Abdul kalam",2,2000,150);
Used_Book ub=new Used_Book("Introduction to Java Programming","978-3-16-148410-0","Yeshwanth Kanitkar",3, 2002,120,5);
System.out.println(nb);
System.out.println(ub);

   }

}
_________________________________

Output:

New_Book : Price=150.0 Title=Wings of Fire, ISBN=978-3-16-148410-0, authors=Abdul kalam, Edition=2, Published_year=2000
Used_Book : Price_new=30.0, Age=5 Title=Introduction to Java Programming, ISBN=978-3-16-148410-0, authors=Yeshwanth Kanitkar, Edition=3, Published_year=2002

_______________Could you plz rate me well.Thank You