Classes and Objects

classes are blueprint . Name of Classes starts with capital letter. 

classes have i)properties

                    ii)Methods -  functions in Class

Example

Object of class

classes and objects

void main(){

  Human jenny = Human(15);   // here we created jenny as object in class of Human

  print(jenny.height);

  

  jenny.talk('Why gods create this universe');

 

}

class Human {

  double height;

  int age = 0;

  

  Human(double startingHeight){

    height = startingHeight;

  }

  

  void talk(String whatTosay){     // talk is method and call of method as shown above

    print(whatTosay);

  }

}

Inheritance

we can create more classes based on another class or we simply say that this we can create class which has inherited property and method from other classes OR PARENT CLASSES

void main(){

  

  Car myCar = Car();

  

  myCar.drive();

  print(myCar.number_of_seats);

  

  ElectricCar myPhoton = ElectricCar();

  

  myPhoton.drive();

  

  myPhoton.batterylevel;

  

}

class Car {

  int number_of_seats = 5;

  

  void drive(){

    print('wheels turn');

  }

}

class ElectricCar extends Car {       // ElectricCar Class takes all                                                             property and method inside class car

  int batterylevel = 100;

                                      // And we can write more prop. and methods 

  void recharge(){

    batterylevel = 100;

  }

}