inheritance_final_const_fat_arrow

void main() {
  var employee = Employee();
  employee.doWork();

  var ferrairCar = FerrariCar();
  var a = A();
  var myObj = SecureDetails();
  print(myObj);
  var names = Names();

  print(Names.tellMyName());

  // final vs const

  const myName = 'Sai Gopi';
  const piiValue = 3.16;
  // myName = "Unknown";
  print(myName);
  final myName2 = DateTime.now();

  print(myName2);
}

class Names {
  // static vs dynamic
  static var appName = 'My First App'; // static
  var screenName; // dynamic

  // static String tellMyName() {
  //   return appName;
  // }
  // fat arrow notation
  static String tellMyName() => appName;
}

class SecureDetails {
  var _secretKey = "37283298389090"; // private

}

// inheritance
// parent => Human
// child => Employee
class Employee extends Human {
  Employee() {
    name = "Sai";
    age = 50;
    super.doWork();
  }

  details() {
    print('name is $name and age is $age');
  }

  // overriding ante emiti ante? parent class lo una method definition ni over ride chasthunam
  @override
  void doWork() {
    //print("$name is doing the work");
    //super.doWork(); => Parent class (Human)
    //this.doWork() =>  Child class (Employee)
  }
}

// class Student extends Human {}

class Human {
  var name;
  var age;

  void doWork() {
    print("Human is doing the work");
  }
}

// multi level inheritance
// class A extends B, C {}
class A extends B {
  A() {
    print("A");
  }
} // A => B, C

class B extends C {
  B() {
    print("B");
  }
} // B => C

class C {
  C() {
    print("C");
  }
} // C => null

class FerrariCar extends Car {
  FerrariCar() {
    print("FerrariCar obj has created");
  }
}

class Swift extends Car {}

class Car {
  Car() {
    print("Car obj has created");
  }
  var color;
  var millage;
  var speed;
  howMuchSpeedIGo() {}
}