courselist.java

Java程序设计技巧与开发实例附书源代码。

public class CourseList
{  public static Course[] getCourses(int numCourses)
   {  Course courses[] = new Course[numCourses];
      for (int i = 0; i < courses.length; i++)
      {  System.out.print("Course description: ");
         String description = Console.readString();
         System.out.print("Grade available [y/n]: ");
         if (Console.readString().equalsIgnoreCase("y"))
         {  System.out.print("Enter grade [A,B,C,D,F]: ");
            courses[i] = new Course(description, Console.readString());
         }
         else
            courses[i] = new Course(description);
      }
   return courses;
   }
   public static void showCourses(Course[] courses)
   {  double sum = 0.0, num = 0.0;
      for (int i = 0; i < courses.length; i++)
      {  courses[i].showCourse();
         if (courses[i].getNumericGrade() >= 0.0)
         {  num++;
            sum += courses[i].getNumericGrade();
         }
      }
      System.out.println("GPA: " + (sum / num));
   }
   public static void main(String args[])
   {  System.out.print("Number of courses: ");
      Course courses[] = getCourses(Console.readInt());
      showCourses(courses);
   }
}