public String toString()
{
  return  title + length + " min. available:" + avail + "\nartist:" + artist + " style: " + category ;
}

Answer:

Yes, this will work. Some of the variables are declared in Video, but they are now declared to be protected and so can be accessed.

Adding a Price

You may have noticed a major design flaw in the definitions of these classes — none of the videos have a price! Say that it is your job to fix this problem. What changes will you make?

All videos have a price, so make changes to the parent class Video. The two child classes will inherit the changes. A new variable price can be added to the parent class. Modify its constructor and its toString() method.

Remember the rule: every constructor starts out with a super() constructor. If you don't explicitly put it in, then the Java compiler automatically puts it in for you. Now look at the definition of Video. The constructor has been modified for the new variable.

class Video
{
  private String  title;    // name of the item
  private int     length;   // number of minutes
  private boolean avail;    // is the video in the store?
  private double  price;    // price, in cents

  // constructor
  public Video( String ttl, int lngth, int pr )
  {
    title = ttl; length = lngth; avail = true; price = pr;
  }

  public String toString()
  {
    return title + ", " + length + " min. available:" + avail " price: $" + price ;
  } 
  
  // setters and getters
  . . . 
  
}

The constructors in the child classes need to be modified to match the new constructor. Also, some new setters and getters have been added.

The complete program including recent changes is available here: Video Store. Save it to a file.

Answer:

Adding a Price

QUESTION 25: