JAVA! Implement a simple grade management program. Grades are stored as real number grade points (4.0, 3.7, 3.3...0.0). Array elements that are occupied will contain a grade within this range. For example, this array would be assumed to contain 4 grades (values outside the valid range represent 'unoccupied' elements): 3.3, 4.0, 2.7, 0, -1, -1, -1... The program includes basic statistical generation (average) and visualization of the data (query for the highest and the lowest grade). There is no requirement for including user input of the grades but the program must include the ability to initialize grades (hard-coded or random). The program will employ a text-based menu-driven interface. The program consists of 3 classes: Driver: starting execution point. ; UserInterface: responsible for displaying all menus, getting user input and determining the appropriate course of action. ; Manager: stores the grades (1D array of double: maximum of 40 elements). While the user-interface class may be responsible for determining which option was selected by the user (e.g., display list, find highest grade etc.) only the manager class that can directly access or change the grade information. That's because the information (grades) is a property of the manager, the grade information is what the manager manages. JAVA !