FINISHED

src/AddingAndRemoving.java

+public interface AddingAndRemoving {
+//    void add(Personnel p);
+//    void remove(Personnel p);
+    void changeLevel(Employee e , int change);
+}

src/Assistant.java

+public class Assistant extends Utility {
+    public Assistant(String name, double basicSalary) {
+        super(name, basicSalary);
+    }
+
+    @Override
+    public void checkReports(Personnel p){
+        Management manager = (Management) p;
+        for (int i = 0; i < manager.getReports().size(); i++) {
+            System.out.println(manager.getReports().get(i));
+        }
+    }
+}

src/Employee.java

@@ -29,4 +29,7 @@ public class Employee extends Personnel {
             this.level--;
         }
     }
+    public void addReport(Report r){
+        reports.add(r);
+    }
 }

src/FinancialManagment.java

+public class FinancialManagment extends Management {
+
+
+    public FinancialManagment(String name, double basicSalary) {
+        super(name, basicSalary);
+    }
+    public void checkSalary(Employee e){
+        System.out.println(e.getCurrentSalary());
+    }
+}

src/HumanManagement.java

+public class HumanManagement extends Management implements AddingAndRemoving {
+
+    public HumanManagement(String name, double basicSalary) {
+        super(name, basicSalary);
+    }
+
+    @Override
+    public void changeLevel(Employee e, int change) {
+        if (change == +1)
+            e.increaseLevel();
+        else if (change == -1)
+            e.decreaseLevel();
+    }
+}

src/Management.java

+import java.util.ArrayList;
+
+public class Management extends Utility {
+    private ArrayList<Report> reports = new ArrayList<>();
+
+    public Management(String name, double basicSalary) {
+        super(name, basicSalary);
+    }
+
+    @Override
+    public void checkReports(Personnel p){
+        Employee employee = (Employee)p;
+        for (int i = 0; i < employee.getReports().size(); i++) {
+            System.out.println(employee.getReports().get(i));
+        }
+    }
+    public void addReport(Report r){
+        reports.add(r);
+    }
+
+    public ArrayList<Report> getReports() {
+        return reports;
+    }
+
+}

src/Utility.java

+public abstract class Utility extends Personnel {
+    public Utility(String name, double basicSalary) {
+        super(name, basicSalary);
+    }
+
+    public abstract void checkReports(Personnel p);
+
+}