Description: Design of 3 categories, respectively, is a student of class Student Undergraduate, undergraduate, graduate class of Postgraduate, where Student class is an abstract class, it contains a student s basic information such as name, grade point average, and a computing course grade Abstract methods. Undergraduate and Postgraduate are its subclasses, which calculates the grade of different ways ( design ). Design of an array of students, not only can hold undergraduate and postgraduate object placed objects. Write the test class test above function.
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090360105+周润+Student\Postgraduate.class
......................\Student.class
......................\TestClass.class
......................\TestClass.java
......................\Undergraduate.class
090360105+周润+Student
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