Java

OOP GUIDE / WORK

BOOK & TEXTBOOK CLASSES - SOLUTIONS

TASK – PART 1 – QUESTION

No solution needed.

TASK – PART 2 – BOOK CLASS

No solution needed.

TASK – PART 3 – IMPLEMENT THE TEXTBOOK CLASS

Here is my solution:

public class Textbook extends Book

{

private int edition;

public Textbook(String title, double price, int edition)

{

super(title, price);

this.edition = edition;

}

//getBookInfo() NOTE:

//The Book class doesn't have a getPrice() method. Sneaky!

//So you must call super's getBookInfo() method.

public String getBookInfo()

{

return super.getBookInfo() + "-" + edition;

}

public boolean canSubstituteFor(Textbook other)

{

if (this.getTitle().equals(other.getTitle()))

{

if (edition >= other.getEdition())

{

return true;

}

}

return false;

}

//getEdition() NOTE

//The description of the work doesn't mention getEdition()

//but it is found in the example work. So you must include it.

public int getEdition()

{

return edition;

}

}

TASK – PART 4 – TESTING

No solution needed.