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void main() {
//abstract class
}

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void main() {
//enums
}

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void main() {
//static
}

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void main() {
//polymorphism
}

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//============Syntax
class ParentClassOrSuperClass {
  // Parent class properties and methods
}

class ChildClassOrSubClass extends ParentClassOrSuperClass {
  // Child class properties and methods
}

// =================Parent class 

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class Book {
  // Private Properties
  String? _title;
  String? _author;
  double? _price;

  // Getter to read the private property _title
  String get title => this._title!;

  // Setter to update the private property _title

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// WITHIN A SINGLE FILE, IT WON'T WORK
class Employee {
  // Private property
  var _name;

  // Getter method to access private property _name
  String getName() {
    return _name;
  }

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class Employee {
  String? name;
  int? age;
  String? department;
  double? salary;

  // Constructor
  Employee(String name, int age, String department, double salary) {
    this.name = name;
    this.age = age;

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class Student {
  // ========== Properties (Attributes of a stident)
  String? name, department;
  int? age, matricNumber;
  double? gpa;
  
  // ========== Methods (Actions a student can do)
  // Methods 1: switchDepartment
  void switchDepartment(String newDepartment) {
    department = newDepartment;

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// ========= SYNTAX 
class ClassName {
// properties or attributes...
//...
// methods or functions...
}


//======== EXAMPLE
//======== EXAMPLE