Exercise1

exercise1/Human.java

@@ -3,7 +3,7 @@
 // 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;
+    public String fullName;
 
     public String getFullName() {
         return fullName;
@@ -17,7 +17,7 @@ public void sayMyName() {
         System.out.println("im a human!");
     }
 
-    public void staticPrint() {
+    public static void staticPrint() {
         System.out.println("this function should always print this string in all subclasses");
     }
 }

exercise1/Main.java

@@ -13,6 +13,39 @@
 
 public class Main {
     public static void main(String[] args) {
+        //Q6
+        Student student = new Student("John Doe");
+        Professor professor = new Professor("Dr. Smith");
+        if (student instanceof Human) {
+            System.out.println(true);
+        }
+        else {
+            System.out.println(false);
+        }
+        if (professor instanceof Human) {
+            System.out.println(true);
+        }
+        else {
+            System.out.println(false);
+        }
 
+        //Q7
+        /*
+        Human human = new Student("whatever");
+        human.sayMyName();
+        */
+
+        //Q8
+        /*
+        Human human = new Professor("whatever");
+        human.sayMyName();
+        */
+
+
+        //Q9
+        /*
+        یک نمونه از کلاس فرزند Student یا Professor به کلاس والد یعنی human اشاره دارد و با بازنویسی در کلاس فرزند اجرا میشود
+        در نتیجه تغییرات در کلاس های فرزند بدون تغیر قسمت های دیگر اجرا میشود
+         */
     }
 }

exercise1/Professor.java

@@ -4,5 +4,35 @@
 //  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 professorFaculty;
+    private String numberOfCourse;
+    private String professorSpecialty;
+
+    public Professor(String fullName){
+    }
+
+    public String getProfessorFaculty() {
+        return professorFaculty;
+    }
+    public String getNumberOfCourse() {
+        return numberOfCourse;
+    }
+    public String getProfessorSpecialty() {
+        return professorSpecialty;
+    }
+    public void setProfessorFaculty(String professorFaculty) {
+        this.professorFaculty = professorFaculty;
+    }
+    public void setNumberOfCourse(String numberOfCourse) {
+        this.numberOfCourse = numberOfCourse;
+    }
+    public void setProfessorSpecialty(String professorSpecialty) {
+        this.professorSpecialty = professorSpecialty;
+    }
+
+    @Override
+    public void sayMyName() {
+        System.out.print(fullName + professorFaculty);
+    }
 }

exercise1/Student.java

@@ -5,5 +5,36 @@
 // 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 fullName;
+    private String studentNumber;
+    private String majorName;
+    private String universityName;
+
+    public Student(String fullName) {
+        this.fullName = fullName;
+    }
+    public String getStudentNumber() {
+        return studentNumber;
+    }
+    public String getMajorName() {
+        return majorName;
+    }
+    public String getUniversityName() {
+        return universityName;
+    }
+    public void setStudentNumber(String studentNumber) {
+        this.studentNumber = studentNumber;
+    }
+    public void setMajorName(String majorName) {
+        this.majorName = majorName;
+    }
+    public void setUniversityName(String universityName) {
+        this.universityName = universityName;
+    }
+
+    public void sayMyName() {
+        System.out.println(fullName);
+    }
 }
+