In our Abstract Classes and Interfaces lesson, we rewrote DataSetBook to take any object that implemented the Measurable interface. As several of you have noted, a Boat may implement Measurable, a Book may implement Measurable, and a Building may implement Measurable, but mixing boats and books and buildings in the same data store makes little sense. Generics give the application writer compile-time help in keeping boats and buildings out of his book store. A Book and DataSetBook classes and a Measurable interface are provided, but feel free to rewrite them if that seems easier. You may also wish to start from a different version of DataSet; that's up to you. You are to write a generic class DataSetGeneric. DataSetGeneric should provide the usual add, size, getMin, getMax and toString methods. This should be a generic class so that only elements of the specified type are allowed into the data store. All of its elements should implement the Measurable interface, however; that's what you will rely on to implement getMin and getMax. Also provide a tester for DataSetGeneric.