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Create a class named Book that contains data fields for the title and number of pages....

Create a class named Book that contains data fields for the title and number of pages. Include get and set methods for these fields. Next, create a subclass named Textbook, which contains an additional field that holds a grade level for the Textbook and additional methods to get and set the grade level field. Write an application that demonstrates using objects of each class. Save the files as Book.java, Textbook.java, and DemoBook.java.

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