first commit

src/Employee.java

+import java.util.ArrayList;
+
+public class Employee {
+
+    protected ArrayList<Payroll> payrolls;
+    protected int defPay;
+    protected int income;
+
+
+    public ArrayList<Payroll> getPayrolls() {
+        return this.payrolls;
+    }
+}

src/Main.java

+public class Main {
+
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}

src/Master.java

+public class Master {
+
+    private Essay[] essays;
+
+}

src/Person.java

+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 this.firstName;
+    }
+
+    public String getLastName() {
+        return this.lastName;
+    }
+
+    public String getID() {
+        return this.ID;
+    }
+
+    public int getJoiningYear() {
+        return this.joiningYear;
+    }
+
+    public Department getDepartment() {
+        return this.department;
+    }
+}

src/ServiceEmployee.java

+public class ServiceEmployee {
+
+    public int incomeCalculate(){
+
+    }
+}

src/Student.java

+public class Student {
+
+    protected Course[] courses;
+
+    public Course[] getCourses() {
+        return courses;
+    }
+}

src/Teacher.java

+import java.util.ArrayList;
+
+public class Teacher {
+
+    private ArrayList<Course> courses;
+
+    private void addCourse(Course course) {
+        this.courses.add(course);
+    }
+    private void removeCourse(Course course){
+        this.courses.remove(course);
+    }
+    public int incomeCalculate(){
+
+    }
+}