EECS2030 Test 4

Programming question

Implement the PictureBook class. A skeleton can be found here. The API can be found here. A jar with the Book class can be found here.

• You have to put your PictureBook class in the test4 package.
• You have to implement inheritance and composition.

package test4;

import java.util.ArrayList;
import java.util.List;

import javax.swing.ImageIcon;

/**
 * A picture book is a special type of book.
 * Each picture book has a collection of pictures.
 * The picture book and the collection of pictures
 * form a composition.
 */
public class PictureBook extends Book
{
    private List<ImageIcon> pictures;

    /**
     * Initializes this picture book with the given title and
     * collection of pictures.
     *
     * @param title the title of this picture book.
     * @param pictures the collection of pictures of this picture book.
     * @pre. pictures != null
     */
    public PictureBook(String title, List<ImageIcon> pictures)
    {
	super(title);
	this.setPictures(pictures);
    }

    /**
     * Initializes this picture book with the title and collection
     * of picture of the given other picture book.
     * 
     * @param book another picture book.
     * @pre. book != null
     */
    public PictureBook(PictureBook book)
    {
	super(book);
	this.setPictures(book.getPictures());
    }

    /**
     * Returns the collection of pictures of this picture book.
     * 
     * @return the collection of pictures of this picture book.
     */
    public List<ImageIcon> getPictures() 
    {
        List<ImageIcon> pictures = new ArrayList<ImageIcon>();
	for (ImageIcon picture : this.pictures)
	{
	    ImageIcon copy = new ImageIcon(picture.getImage());
	    pictures.add(copy);
	}
	return pictures;
    }

    /**
     * Sets the collection of pictures of this picture book to the
     * given collection of pictures.
     * 
     * @param pictures the collection of pictures of this picture book.
     * @pre. pictures != null
     */
    public void setPictures(List<ImageIcon> pictures) 
    {
        this.pictures = new ArrayList<ImageIcon>();
	for (ImageIcon picture : pictures)
	{
	    ImageIcon copy = new ImageIcon(picture.getImage());
	    this.pictures.add(copy);
	}
    }

    /**
     * Returns a string representation of this picture book.
     * This string representation consists of "The book entitled "
     * followed by the title of this book, followed by " with ",
     * followed by the number of picture, followed by " pictures".
     *
     * @return a string representation of this picture book.
     */
    public String toString()
    {
	return super.toString() + " with " + this.getPictures().size() + " pictures";
    }
}

Other questions

public class CreditCard
{
   private double balance;

   /**
    * Checks if the balance of this card is positive.
    *
    * @throws RuntimeException if the balance of this card is not positive.
    */
   public void checkPositive() throws RuntimeException
   {
      if (this.balance <= 0)
      {
         throw new RuntimeException("Balance is negative");
      }
   }
}

public class RewardCard extends CreditCard
{
   private int points;

   /**
    * Checks if the balance of this card is positive.
    *
    * @throws Exception if the balance of this card is not positive.
    */
   public void checkPositive() throws Exception
   {
      if (this.balance <= 0)
      {
         throw new Exception("Balance is negative");
      }
   } 
}