Question

Write an abstract class “Student” and three concrete classes, “UnderGrad” and “Graduate” both inherit from Student and “PostGraduate” that inherits form “Graduate”.

Write the class definition for the abstract class “Student”. The class definition should include private instance variables of type String to hold the student’s first name, a string for his/her major and an int to hold the number of units taken. Getter and setter methods for each of the variables should be included in the class definition. Also include abstract method “calculateTuition()”

abstract public int calculateTuition(int units);

Write three argument constructor in the student class to initialize student’s name, major, and units taken

Have their constructors call the parent’s constructor

These concrete classes should override the abstract method

Undergrad, multiply by $250

Graduate, multiply by $500

Postgraduate, multiply by $750

Tester class should create objects of each and add them to the arraylist and print out the tuition

Answer 1

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;

abstract class Student{
    private String firstName,major;
    private int units;

    public Student(String firstName, String major, int units) {
        this.firstName = firstName;
        this.major = major;
        this.units = units;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    public int getUnits() {
        return units;
    }

    public void setUnits(int units) {
        this.units = units;
    }

    abstract public int calculateTution();

    @Override
    public String toString() {
        return "Student{" +
                "firstName='" + firstName + '\'' +
                ", major='" + major + '\'' +
                ", units=" + units +
                '}';
    }
}

class UnderGraduate extends Student{

    public UnderGraduate(String firstName, String major, int units) {
        super(firstName, major, units);
    }

    @Override
    public int calculateTution() {
        return this.getUnits()*250;
    }

}

class Graduate extends Student{

    public Graduate(String firstName, String major, int units) {
        super(firstName, major, units);
    }

    @Override
    public int calculateTution() {
        return this.getUnits()*500;
    }
}

class PostGraduate extends Graduate{

    public PostGraduate(String firstName, String major, int units) {
        super(firstName, major, units);
    }

    @Override
    public int calculateTution() {
        return this.getUnits()*750;
    }
}

class Main{
    public static void main(String[] args) throws IOException {
        List<Student> students = new ArrayList();
        students.add(new UnderGraduate("Jenny","Electronics",8));
        students.add(new Graduate("Raj","CSE",5));
        students.add(new PostGraduate("Ramesh","IT",2));
        for(Student student : students){
            System.out.println(student+" , tution fees : "+student.calculateTution());
        }
    }
}

OUTPUT :