Android™ How to Program, Second Edition

Storing Student Grades in an Array in Class GradeBook

Class GradeBook (Fig. E.13) uses an array of ints to store several students’ grades on a single exam. This eliminates the need to repeatedly input the same set of grades. Array grades is declared as an instance variable (line 7), so each GradeBook object maintains its own set of grades. The constructor (lines 10–14) has two parameters—the name of the course and an array of grades. When an application (e.g., class GradeBookTest in Fig. E.14) creates a GradeBook object, the application passes an existing int array to the constructor, which assigns the array’s reference to instance variable grades (line 13). The grades array’s size is determined by the length of the array that’s passed to the ...