done!

exercise1/Human.java

@@ -1,7 +1,5 @@
 package exercise1;
 
-// 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 {
     private String fullName;
 
@@ -17,7 +15,7 @@ public void sayMyName() {
         System.out.println("im a human!");
     }
 
-    public void staticPrint() {
+    public final void staticPrint() { // made it final so it cannot be overridden
         System.out.println("this function should always print this string in all subclasses");
     }
 }

exercise1/Main.java

@@ -3,16 +3,39 @@
 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();
+        student.setFullName("John Doe");
+        student.setStudentNumber(123);
+        student.setMajorName("Computer Science");
+        student.setUniversityName("Harvard University");
 
+        Professor professor = new Professor();
+        professor.setFullName("Jane Smith");
+        professor.setProfessorSpecialty("Mathematics");
+        professor.setProfessorFaculty("Faculty of Science");
+        professor.setNumberOfCourse(5);
+
+        List<Human> humans = new ArrayList<>();
+        humans.add(student);
+        humans.add(professor);
+
+        for (Human human : humans) {
+            if (human instanceof Student) {
+                System.out.println("This is a Student");
+            } else if (human instanceof Professor) {
+                System.out.println("This is a Professor");
+            }
+            human.sayMyName();
+        }
+
+        Human human1 = new Student();
+        human1.setFullName("Alice Brown");
+        human1.sayMyName(); // Output: Alice Brown
+
+        Human human2 = new Professor();
+        human2.setFullName("Bob Johnson");
+        human2.sayMyName(); // Output: Bob Johnson from null (since professorFaculty is not set)
     }
 }

exercise1/Professor.java

@@ -1,8 +1,36 @@
 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 numberOfCourse;
+
+    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 getNumberOfCourse() {
+        return numberOfCourse;
+    }
+
+    public void setNumberOfCourse(int numberOfCourse) {
+        this.numberOfCourse = numberOfCourse;
+    }
+
+    @Override
+    public void sayMyName() {
+        System.out.println(getFullName() + " from " + getProfessorFaculty());
+    }
 }

exercise1/Student.java

@@ -1,9 +1,36 @@
 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 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());
+    }
 }