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src/org/university/core/Course.java

+package org.university.core;
+
+import org.university.core.GradStudent;
+import org.university.core.Professor;
+import org.university.core.Student;
+
+import java.util.ArrayList;
+
+public class Course {
+    private String name;
+    private Professor instructor;
+    private ArrayList<Student> students = new ArrayList<Student>();
+    private GradStudent teacherAssistance;
+
+
+    public GradStudent getTeacherAssistance() {
+        return teacherAssistance;
+    }
+
+    public void setTeacherAssistance(GradStudent teacherAssistance) {
+        this.teacherAssistance = teacherAssistance;
+    }
+
+    public Course(String name, Professor instructor) {
+        this.name = name;
+        this.instructor = instructor;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Professor getInstructor() {
+        return instructor;
+    }
+
+    public ArrayList<Student> getStudents() {
+        return students;
+    }
+
+    public void addStudent(Student student){
+        this.students.add(student);
+    }
+}

src/org/university/core/Department.java

+package org.university.core;
+
+import java.util.ArrayList;
+public class Department {
+    private String name;
+    private ArrayList<Course> courses = new ArrayList<Course>();
+    public Department(String name){
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public ArrayList<Course> getCourses() {
+        return courses;
+    }
+
+    public void addCourse(Course course){
+        courses.add(course);
+    }
+}

src/org/university/core/Employee.java

+package org.university.core;
+
+import java.util.ArrayList;
+
+public abstract class Employee extends Person {
+    protected ArrayList<Statement> bankStatements;
+    protected String position;
+    protected double basicIncome;
+
+    public Employee(String firstName, String lastName, String id, int joiningYear, Department department, String position, double basicIncome) {
+        super(firstName, lastName, id, joiningYear, department);
+        this.position = position;
+        this.bankStatements = new ArrayList<>();
+        this.basicIncome = basicIncome;
+    }
+
+    public void addBankStatements(Statement s)
+    {
+        this.bankStatements.add(s);
+    }
+
+    public ArrayList<Statement> getBankStatements() {
+        return bankStatements;
+    }
+
+    public String getPosition() {
+        return position;
+    }
+
+    public void setBasicIncome(double basicIncome) {
+        this.basicIncome = basicIncome;
+    }
+
+    public abstract double calCurrentIncome();
+    public abstract Boolean isPromotable();
+}

src/org/university/core/GradStudent.java

+package org.university.core;
+
+import java.util.ArrayList;
+
+public class GradStudent extends Student {
+    private ArrayList<Publication> publications;
+    private Professor advisor;
+
+    public GradStudent(String firstName, String lastName, String id, int joiningYear, Department department, ArrayList<Course> courses,  Professor advisor) {
+        super(firstName, lastName, id, joiningYear, department, courses);
+        this.publications = publications;
+        this.publications = new ArrayList<Publication>();
+        this.advisor = advisor;
+    }
+
+    public ArrayList<Publication> getPublications() {
+        return publications;
+    }
+
+    public void addPublication(Publication publication)
+    {
+        this.publications.add(publication);
+    }
+}

src/org/university/core/Person.java

+package org.university.core;
+
+public class Person {
+    protected String firstName;
+    protected String lastName;
+    protected String id;
+    protected int joiningYear;
+    protected Department department;
+
+    public Person(String firstName, String lastName, String id, int joiningYear, Department department) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.id = id;
+        this.joiningYear = joiningYear;
+        this.department = department;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public int getJoiningYear() {
+        return joiningYear;
+    }
+
+    public Department getDepartment() {
+        return department;
+    }
+}

src/org/university/core/Professor.java

+package org.university.core;
+
+import java.util.ArrayList;
+
+public class Professor extends Employee{
+    private ArrayList<Course> courses;
+    private String group;
+
+    public Professor(String firstName, String lastName, String id, int joiningYear, Department department, String position, double basicIncome, String group) {
+        super(firstName, lastName, id, joiningYear, department, position, basicIncome);
+        this.group = group;
+        this.courses = new ArrayList<Course>();
+    }
+
+    public double getCurrentIncome()
+    {
+        return super.basicIncome;
+    }
+    public ArrayList<Course> getCourses()
+    {
+        return this.courses;
+    }
+    public void addCourse(Course course)
+    {
+        this.courses.add(course);
+    }
+
+    public String getGroup() {
+        return group;
+    }
+
+    public double calCurrentIncome()
+    {
+    }
+
+    public Boolean isPromotable()
+    {
+
+    }
+}

src/org/university/core/Publication.java

+package org.university.core;
+
+public class Publication {
+    private String title;
+    private int year;
+
+    public Publication(String title, int year) {
+        this.title = title;
+        this.year = year;
+    }
+}

src/org/university/core/ServiceEmployee.java

+package org.university.core;
+
+public class ServiceEmployee extends Employee{
+    public ServiceEmployee(String firstName, String lastName, String id, int joiningYear, Department department, String position, double basicIncome) {
+        super(firstName, lastName, id, joiningYear, department, position, basicIncome);
+    }
+    public double calCurrentIncome()
+    {
+    }
+    public Boolean isPromotable()
+    {
+        
+    }
+}

src/org/university/core/Statement.java

+package org.university.core;
+
+public class Statement {
+    private double amount;
+    Employee reciever;
+
+    public Statement(double amount, Employee reciever) {
+        this.amount = amount;
+        this.reciever = reciever;
+    }
+
+    public double getAmount() {
+        return amount;
+    }
+
+    public Employee getReciever() {
+        return reciever;
+    }
+
+    public void setAmount(double amount) {
+        this.amount = amount;
+    }
+
+    public void setReciever(Employee reciever) {
+        this.reciever = reciever;
+    }
+}

src/org/university/core/Student.java

+package org.university.core;
+
+import java.util.ArrayList;
+
+public class Student extends Person{
+    ArrayList<Course> courses;
+
+    public Student(String firstName, String lastName, String id, int joiningYear, Department department, ArrayList<Course> courses) {
+        super(firstName, lastName, id, joiningYear, department);
+        this.courses = courses;
+    }
+
+    public ArrayList<Course> getCourses() {
+        return courses;
+    }
+
+    public void addCourse( Course course)
+    {
+        courses.add(course);
+    }
+}

src/org/university/core/UnderGradStudent.java

+package org.university.core;
+
+import java.util.ArrayList;
+
+public class UnderGradStudent extends Student{
+    public UnderGradStudent(String firstName, String lastName, String id, int joiningYear, Department department, ArrayList<Course> courses) {
+        super(firstName, lastName, id, joiningYear, department, courses);
+    }
+}