Create an abstract class named Publication. This class should define an abstract method getPublicationType$()$ and a nonabstract method getTitle$()$ that returns the value of a title data field as well as a setTitle$()$ method used to set the title data field. The toString$()$ method of the Publication class should concatenate the result of getPublicationType$()$ with getTitle$().$ Create two subclasses of Publication$$Magazine and Book$$that each implement the getPublicationType$()$ method. Finally, create a PublicationDemo class with a main$()$ method that creates an instance of both Magazine and Book, and prints the result of the toString$()$ method.