Question

a) Create an abstract class Student. The class contains fields for student Id number, name, and tuition. Includes a constructor that requires parameters for the ID number and name. Include get and set method for each field; setTuition() method is abstract.

b) The Student class should throw an exception named InvalidNameException when it receives an invalid student name (student name is invalid if it contains digits).

c) Create three student subclasses named UndergradStudent, GradeStudent, and StudentAtLarge, each with a unique setTuition() method and a field CGPA. Create one or more constructors for each class. Tuition for an UnderGraduateStudent is $4000 per semester, tuition for an GraduateStudent is $6000 per semester, and tutition for a StudentAtLarge is $2000 per semester.

d) The UndergradStudent, GradeStudent, and StudentAtLarge classes should throw an exception names InvalidCGPAException when it receives an invalid cgpa, a valid cgpa is between 0 and 4.

e) Write an application named Driver that creates objects of each subclass and demonstrate how the methods work.



2

For example creating an object of UndergradStudent

UndergradStudent ugStud= new UndergradStudent(111, "Lambert1",3.4);
would raise an exception Student name is invalid
UndergradStudent ugStud= new UndergradStudent (111, "Lambert",4.4);
would raise an exception Student name cgpa is invalid
UndergradStudent ugStud= new UndergradStudent (111, "Lambert",3.4);
The output would be
Student Id 111 name Lambert CGPA 3.4 Tuition is 4000.0.

Answer 1

Student.java

import javax.naming.InvalidNameException;

public abstract class Student {

   int studentID;
   String name;
   double tutuion;
   public Student(int studentID, String name) {
       super();
       this.studentID = studentID;
       setName(name);
   }
   public int getStudentID() {
       return studentID;
   }
   public void setStudentID(int studentID) {
       this.studentID = studentID;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
      
       if(name.contains("[0-9]")) {
           try {
               throw new InvalidNameException("Name should not contain Digits");
           } catch (InvalidNameException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
          
           return;
       }
          
       this.name = name;
   }
   public double getTutuion() {
       return tutuion;
   }
   public abstract void setTutuion();
  
  
}

UndergraduateStudent.java

import javax.naming.InvalidNameException;

public class UndergraduateStudent extends Student{
  
   double cgpa;
  

   public UndergraduateStudent(int studentID, String name,double cgpa) {
       super(studentID, name);
       setCgpa(cgpa);
       setTutuion();
       // TODO Auto-generated constructor stub
   }

   @Override
   public void setTutuion() {
       // TODO Auto-generated method stub
       this.tutuion=4000;
   }

   public void setCgpa(double cgpa) {
      
       if(cgpa>0 && cgpa<=4)
       this.cgpa = cgpa;
       else
           try {
               throw new InvalidNameException("CGPA should be Between 0 and 4");
           } catch (InvalidNameException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
   }
  
public void print() {
      
       System.out.println("Student Id "+this.studentID+" name "+this.name+" CGPA "+this.cgpa+" Tution is "+this.tutuion);
   }
  
  

}

GradeStudent.java

import javax.naming.InvalidNameException;

public class GradeStudent extends Student{
  
   double cgpa;

   public GradeStudent(int studentID, String name,double cgpa) {
       super(studentID, name);
       setCgpa(cgpa);
       setTutuion();
       // TODO Auto-generated constructor stub
   }

   @Override
   public void setTutuion() {
       // TODO Auto-generated method stub
       this.tutuion=6000;
   }

   public void setCgpa(double cgpa) {
       if(cgpa>0 && cgpa<=4)
           this.cgpa = cgpa;
           else
               try {
                   throw new InvalidNameException("CGPA should be Between 0 and 4");
               } catch (InvalidNameException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
   }
  
public void print() {
      
       System.out.println("Student Id "+this.studentID+" name "+this.name+" CGPA "+this.cgpa+" Tution is "+this.tutuion);
   }
}

StudentAtLarge.java

import javax.naming.InvalidNameException;

public class StudentAtLarge extends Student{
  
   double cgpa;

   public StudentAtLarge(int studentID, String name,double cgpa) {
       super(studentID, name);
       setCgpa(cgpa);
       setTutuion();
       // TODO Auto-generated constructor stub
   }

   @Override
   public void setTutuion() {
       // TODO Auto-generated method stub
       this.tutuion=2000;
      
      
   }
  
   public void setCgpa(double cgpa) {
       if(cgpa>0 && cgpa<=4)
           this.cgpa = cgpa;
           else
               try {
                   throw new InvalidNameException("CGPA should be Between 0 and 4");
               } catch (InvalidNameException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }
   }
  
   public void print() {
      
       System.out.println("Student Id "+this.studentID+" name "+this.name+" CGPA "+this.cgpa+" Tution is "+this.tutuion);
   }

}

Driver.java

public class Driver {

   public static void main(String[] args) {
       // TODO Auto-generated method stub

      
       UndergraduateStudent ugStud= new UndergraduateStudent(111, "Lambert1",3.4);
       ugStud.print();
       UndergraduateStudent ugStud1= new UndergraduateStudent (111, "Lambert",4.4);
      
      
       GradeStudent grStud= new GradeStudent(111, "Lambert1",3.4);
       grStud.print();
       GradeStudent grStud1= new GradeStudent(111, "Lambert",4.4);
      
      
       StudentAtLarge st= new StudentAtLarge(111, "Lambert1",3.4);
       st.print();
       StudentAtLarge st1= new StudentAtLarge(111, "Lambert",4.4);
      
      
   }

}

Output

Student Id 111 name Lambert1 CGPA 3.4 Tution is 4000.0
javax.naming.InvalidNameException: CGPA should be Between 0 and 4
   at test.UndergraduateStudent.setCgpa(UndergraduateStudent.java:29)
   at test.UndergraduateStudent.<init>(UndergraduateStudent.java:12)
   at test.Driver.main(Driver.java:11)
Student Id 111 name Lambert1 CGPA 3.4 Tution is 6000.0
javax.naming.InvalidNameException: CGPA should be Between 0 and 4
   at test.GradeStudent.setCgpa(GradeStudent.java:27)
   at test.GradeStudent.<init>(GradeStudent.java:11)
   at test.Driver.main(Driver.java:16)
Student Id 111 name Lambert1 CGPA 3.4 Tution is 2000.0
javax.naming.InvalidNameException: CGPA should be Between 0 and 4
   at test.StudentAtLarge.setCgpa(StudentAtLarge.java:29)
   at test.StudentAtLarge.<init>(StudentAtLarge.java:11)
   at test.Driver.main(Driver.java:21)

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