diff --git a/exercise1/Human.java b/exercise1/Human.java
index 4b9b45e..1646eb6 100644
--- a/exercise1/Human.java
+++ b/exercise1/Human.java
@@ -17,7 +17,7 @@ public void sayMyName() {
         System.out.println("im a human!");
     }
 
-    public void staticPrint() {
+    public 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..3968092 100644
--- a/exercise1/Main.java
+++ b/exercise1/Main.java
@@ -1,18 +1,27 @@
 package exercise1;
 
-import java.util.ArrayList;
-import java.util.List;
-
-// After completing the Student and Professor classes, create an instance of each one:
-//  6. Using instanceof keyword, check if the instances that you have created are really an instance of human class
-//  7. Write the following code: Human human = new Student(); What is the output of human.sayMyName() ?
-//  8. Now write this:
-//  Human human = new Professor();
-//  What is the output of human.sayMyName() ?
-//  9. What can we understand from question 7 and 8?
- 
 public class Main {
     public static void main(String[] args) {
+        Student student = new Student();
+        Professor professor = new Professor();
+
+        String result1 = (student instanceof Human)? "student an instance of Human" : "Student is not an instance of Human.";
+        System.out.println(result1);
+        String result2 = (professor instanceof Human)? "professor an instance of Human" : "professor is not an instance of Human.";
+        System.out.println(result2);
+
+        Human human1 = new Student("negin Ahmadi", 11111, "major", "university");
+        Human human2 = new Professor("name_one", "Specialty", "faculty", 2);
 
+        human1.sayMyName();
+        human2.sayMyName();
+        /* 9
+کد بالا نمونه ای از چند شکلی در برنامه نویسی هست
+ هر 2 کلاس از کلاس Human ارث بری کرده اند برای همین میتوان
+ یک شی از کلاس Human ساخت که با کلاس هایی که از ان ارث برده اند مقدار دهی میشود
+ اما متد های ان با توجه به کلاس مربوط مجدد نوشته شده می شوند برای همین
+ sayMyName
+ خروجی های متفاوتی بر اساس چیزی که در کلاس های ارث برده شده نوشته شده نشان میدهد
+        */
     }
 }
diff --git a/exercise1/Professor.java b/exercise1/Professor.java
index 7c3b522..525507d 100644
--- a/exercise1/Professor.java
+++ b/exercise1/Professor.java
@@ -1,8 +1,45 @@
 package exercise1;
 
-// Implement or extend the human class to make a professor class...
-//  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, String professorSpecialty, String professorFaculty, int numberOfCourses) {
+        setFullName(fullName);
+        setProfessorSpecialty(professorSpecialty);
+        setProfessorFaculty(professorFaculty);
+        setNumberOfCourses(numberOfCourses);
+    }
+
+    public Professor(){}
+
+    public String getProfessorSpecialty() {
+        return professorSpecialty;
+    }
+
+    public void setProfessorSpecialty(String professorSpecialty) {
+        this.professorSpecialty = professorSpecialty;
+    }
+
+    public String getProfessorFaculty() {
+        return professorFaculty;
+    }
+
+    public void setProfessorFaculty(String professorFaculty) {
+        this.professorFaculty = professorFaculty;
+    }
+
+    public int getNumberOfCourses() {
+        return numberOfCourses;
+    }
+
+    public void setNumberOfCourses(int numberOfCourses) {
+        this.numberOfCourses = numberOfCourses;
+    }
+
+    @Override
+    public void sayMyName() {
+        System.out.println(getFullName() + " : " + getProfessorFaculty());
+    }
 }
diff --git a/exercise1/Student.java b/exercise1/Student.java
index 0f8f606..4403b5f 100644
--- a/exercise1/Student.java
+++ b/exercise1/Student.java
@@ -1,9 +1,45 @@
 package exercise1;
 
-// Human is an abstract concept, so we have created an abstract class to represent it...
-// Implement or extend the Human class to make a student class.
-// 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 extends Human {
+    private int studentNumber;
+    private String majorName;
+    private String universityName;
 
-public class Student {
+    public Student(String fullName, int studentNumber, String majorName, String universityName) {
+        setFullName(fullName);
+        setStudentNumber(studentNumber);
+        setUniversityName(universityName);
+        setMajorName(majorName);
+    }
+
+    public Student() {}
+
+    public int getStudentNumber() {
+        return studentNumber;
+    }
+
+    public void setStudentNumber(int studentNumber) {
+        this.studentNumber = studentNumber;
+    }
+
+    public String getMajorName() {
+        return majorName;
+    }
+
+    public void setMajorName(String majorName) {
+        this.majorName = majorName;
+    }
+
+    public String getUniversityName() {
+        return universityName;
+    }
+
+    public void setUniversityName(String universityName) {
+        this.universityName = universityName;
+    }
+
+    @Override
+    public void sayMyName() {
+        System.out.println(getFullName());
+    }
 }
diff --git a/exercise1/negin.pdf b/exercise1/negin.pdf
new file mode 100644
index 0000000..50a3170
Binary files /dev/null and b/exercise1/negin.pdf differ