Media Interface
This is an interface with four methods that every class considered to be some form of media should be able to define.
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public <T> Comparable<T> getId(): Returns a generic type Id which will be an Integer or a String based on whether a Book implements Media or a CD. -
getCreator(): Returns a String and has no arguments. Its return value should be the name of the person responsible for creating this Media. -
getTitle(): Returns a String and has no arguments. Its return value should be the title of this Media. -
getYear(): Returns an int and has no arguments. Its return value should be the year that this Media was created.