second commit

src/AbstarctEmployee.java

 import java.util.ArrayList;
 
-public class Employee {
+public class AbstarctEmployee {
 
     protected ArrayList<Payroll> payrolls;
     protected int defPay;
@@ -10,4 +10,12 @@ public class Employee {
     public ArrayList<Payroll> getPayrolls() {
         return this.payrolls;
     }
+
+    public int getDefPay() {
+        return defPay;
+    }
+
+    public int incomeCalculate(){
+
+    }
 }

src/Course.java

 public class Course {
+
+    private String title;
+    private String description;
+
+    public String getTitle() {
+        return title;
+    }
+
+    public String getDescription() {
+        return description;
+    }
 }

src/Department.java

+import java.util.ArrayList;
+
 public class Department {
+
+    private ArrayList<Course> courses;
+    private String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public ArrayList<Course> getCourses() {
+        return courses;
+    }
 }

src/Essay.java

 public class Essay {
+
+    private String title;
+    private int modYear;
+
+    public String getTitle() {
+        return title;
+    }
+
+    public int getModYear() {
+        return modYear;
+    }
 }

src/Master.java

+import java.util.ArrayList;
+
 public class Master {
 
-    private Essay[] essays;
+    private ArrayList<Essay> essays;
 
+    public ArrayList<Essay> getEssays() {
+        return essays;
+    }
 }

src/Payroll.java

 public class Payroll {
+
+    private int id;
+    private int income;
+    private int date;
+    private Person owner;
+
+    public int getIncome() {
+        return income;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public int getDate() {
+        return date;
+    }
+
+    public Person getOwner() {
+        return owner;
+    }
 }

src/Student.java

+import java.util.ArrayList;
+
 public class Student {
 
-    protected Course[] courses;
+    protected ArrayList<Course> courses;
 
-    public Course[] getCourses() {
+    public ArrayList<Course> getCourses() {
         return courses;
     }
 }