diff --git a/exercise1/Ex9.pdf b/exercise1/Ex9.pdf
new file mode 100644
index 0000000..87a017e
Binary files /dev/null and b/exercise1/Ex9.pdf differ
diff --git a/exercise1/Human.java b/exercise1/Human.java
index 4b9b45e..9076bca 100644
--- a/exercise1/Human.java
+++ b/exercise1/Human.java
@@ -2,22 +2,22 @@
 
 // 1.Change the staticPrint() method so that its output cannot be changed in all the classes that extend or implement Human.
 
-public abstract class Human {
+public abstract class Human{
     private String fullName;
 
-    public String getFullName() {
+    public String getFullName(){
         return fullName;
     }
 
-    public void setFullName(String fullName) {
+    public void setFullName(String fullName){
         this.fullName = fullName;
     }
 
-    public void sayMyName() {
+    public void sayMyName(){
         System.out.println("im a human!");
     }
 
-    public void staticPrint() {
+    public static final void staticPrint(){
         System.out.println("this function should always print this string in all subclasses");
     }
 }
diff --git a/exercise1/Main.java b/exercise1/Main.java
index ad47473..4f149be 100644
--- a/exercise1/Main.java
+++ b/exercise1/Main.java
@@ -1,4 +1,3 @@
-package exercise1;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -13,6 +12,20 @@
  
 public class Main {
     public static void main(String[] args) {
+        Student student = new Student();
+        System.out.println(student instanceof Human); // true
+        Professor professor = new Professor();
+        System.out.println(professor instanceof Human); // true
 
+     
+        Human human1 = new Student();
+        human1.sayMyName();
+        // -> Fullname: null
+        
+        Human human2 = new Professor();
+        human2.sayMyName();
+        // -> Fullname: null
+        // ProfessorFaculty: null
+        
     }
 }
diff --git a/exercise1/Professor.java b/exercise1/Professor.java
index 7c3b522..2a5b0f3 100644
--- a/exercise1/Professor.java
+++ b/exercise1/Professor.java
@@ -4,5 +4,42 @@
 //  4.Add the following attributes to this class with setters and getters: professorSpecialty, professorFaculty, numberOfCourse
 //  5.Change the professor class so that when we call the sayMyName() method on an instance of this class, fullName of the professor plus their professorFaculty is printed.
  
-public class Professor {
+public class Professor extends Human{
+    private String professorSpecialty;
+    private String professorFaculty;
+    private int numberOfCourses;
+    
+    // public Professor(String fullName){
+    //     super.setFullName(fullName);
+    // }
+    
+    // professorSpecialty
+    public String getProfessorSpecialty(){
+        return professorSpecialty;
+    }
+    public void setProfessorSpecialty(String professorSpecialty){
+        this.professorSpecialty = professorSpecialty;
+    }
+    
+    // professorFaculty
+    public String getProfessorFaculty(){
+        return professorFaculty;
+    }
+    public void setProfessorFaculty(String professorFaculty){
+        this.professorFaculty = professorFaculty;
+    }
+    
+    // numberOfCourse
+    public int getNumberOfCourses(){
+        return numberOfCourses;
+    }
+    public void setNumberOfCourses(int numberOfCourses){
+        this.numberOfCourses = numberOfCourses;
+    }
+    
+    // sayMyName
+    public void sayMyName(){
+        System.out.println("FullName: " + getFullName());
+        System.out.println("ProfessorFaculty: " + getProfessorFaculty());
+    }
 }
diff --git a/exercise1/Student.java b/exercise1/Student.java
index 0f8f606..051a2c1 100644
--- a/exercise1/Student.java
+++ b/exercise1/Student.java
@@ -5,5 +5,41 @@
 // 2. Change the student class so that when we call the sayMyName() method on an instance of this class, the fullName attribute of the student is printed.
 // 3.Add the following attributes to the student class with setters and getters: studentNumber, majorName, universityName
 
-public class Student {
+public class Student extends Human{
+    private String studentNumber;
+    private String majorName;
+    private String universityName;
+
+    // public Student(String fullName){
+    //     super.setFullName(fullName);
+    // }
+    
+    // studentNumber
+    public String getStudentNumber(){
+        return studentNumber;
+    }
+    public void setStudentNumber(){
+        this.studentNumber = studentNumber;
+    }
+    
+    // majorName
+    public String getMajorName(){
+        return majorName;
+    }
+    public void setMajorName(String majorName){
+        this.majorName = majorName;
+    }
+    
+    // universityName
+    public String getUniversityName(){
+        return universityName;
+    }
+    public void setUniversityName(String universityName){
+        this.universityName = universityName;
+    }
+    
+    // sayMyName
+    public void sayMyName(){
+        System.out.println("Fullname:" + getFullName());
+    }
 }