// Fig. 3.10: GradeBook.java // GradeBook class with a constructor to initialize the course name. public class GradeBook { private String courseName; // course name for this GradeBook // constructor initializes courseName with String argument public GradeBook( String name ) { courseName = name; // initializes courseName } // end constructor // method to set the course name public void setCourseName( String name ) { courseName = name; // store the course name } // end method setCourseName // method to retrieve the course name public String getCourseName() { return courseName; } // end method getCourseName // display a welcome message to the GradeBook user public void displayMessage() { // this statement calls getCourseName to get the // name of the course this GradeBook represents System.out.printf( "Welcome to the grade book for\n%s!\n", getCourseName() ); } // end method displayMessage } // end class GradeBook
// Fig. 3.11: GradeBookTest.java // GradeBook constructor used to specify the course name at the // time each GradeBook object is created. public class GradeBookTest { // main method begins program execution public static void main( String[] args ) { // create GradeBook object GradeBook gradeBook1 = new GradeBook( "CS101 Introduction to Java Programming" ); GradeBook gradeBook2 = new GradeBook( "CS102 Data Structures in Java" ); // display initial value of courseName for each GradeBook System.out.printf( "gradeBook1 course name is: %s\n", gradeBook1.getCourseName() ); System.out.printf( "gradeBook2 course name is: %s\n", gradeBook2.getCourseName() ); } // end main } // end class GradeBookTest