/* 
 * TestStudent is a driver class that tests the Student 
 * and GradStudent classes, demonstrating inheritance and polymorphism.
 * Don Chamberlin, March 2009
 */

class TestStudent {
   public static void main(String[] args) {
      Student s1 = new Student("Peter", "Physics");
      Student s2 = new Student("Michelle", "Math");
      Student[] a = {s1, s2};
      s2.setGpa(3.5);
      s2.setCoursesCompleted();
      for (Student s:a) {
         if (s.readyToGraduate()) 
            System.out.println(s +
                  " is ready to graduate.");
         else 
            System.out.println(s +
                  " is not ready to graduate.");
      }
      Student s = new Student("Bill", "Politics");
      GradStudent gs = new GradStudent("Hillary",
                      "Law", "Reforming Health Care");
      Student[] students = {s, gs};
      for (Student ss:students)
         if (ss.readyToGraduate())
            System.out.println(ss + " is ready.");
         else System.out.println(ss + " is not ready.");
   }  // end of main()
}  // end of class TestStudent

class Student {
   private String name;
   private String major;
   private double gpa;
   private boolean coursesCompleted;
   public Student(String name, String major) {
      this.name = name;
      this.major = major;
      this.gpa = 0.0;
      this.coursesCompleted = false;
   }
   public String getName() { return name; } 
   public String getMajor() { return major; }
   public double getGpa() { return gpa; }
   public void setGpa(double gpa) {
      this.gpa = gpa;
   }
   public void setCoursesCompleted() {
      this.coursesCompleted = true;
   }
   public String toString() {
      return "Student " + name;
   }
   public boolean readyToGraduate() {
      if (gpa >= 2.0 && coursesCompleted)
         return true;
      else return false;
   }
}  // end of class Student

class GradStudent extends Student {
   private String thesisTopic;
   private boolean thesisCompleted;
   public GradStudent(String name, 
               String major, String topic) {
      super(name, major);   
      this.thesisTopic = topic;
      this.thesisCompleted = false;
   }
   void setThesisCompleted() {
      this.thesisCompleted = true;
   }
   public String toString() {
      return "Grad Student " + this.getName();
   }
   public boolean readyToGraduate() {
      if (super.readyToGraduate() && thesisCompleted)
         return true;
      else return false;
   }
}  // end of class GradStudent