CMSC 202 — Fall 2011

CatalogItem Class

CatalogItem is a generic class that will take two type parameters T and S. T will represent the type of a CatalogItem's ID and will be bounded by the Comparable interface. S will represent the type of a CatalogItem's contained object and will be bounded by the Media interface that we have created. CatalogItem must also implement the Comparable interface itself so that we may sort CatalogItems.

Hence, the CatalogItem class would be declared as follows :

  public class CatalogItem<T extends Comparable<T>,S extends Media> implements Comparable<CatalogItem<T,S>>
  {
	//your code
  }

• Instance variables: Declare a variable, catalogID, of type T and a contained object, media, of type S.
• Constructor: Take in arguments of type T and S and initialize catalogID and media with these values.
• compareTo Method: Write a compareTo method that simply returns the the compareTo of the calling object's catalogID and the argument object's catalogID. Why can we assume that catalogID will have a compareTo method?
• toString Method: Write a toString method that returns the concatenation of catalogID's toString with the return values for media's getCreator, getTitle, and getYear methods. Why can we assume that media will have these methods?