class and object in Dart

Dart class

void main(){
  //dema is the actual objet
  Human dema = Human(height:15,age:12);
  print(dema.height);
  dema.talk('Why is the sky blue??');
  
  Human innocent = Human(height: 1.6,age:30);
  print(innocent.height);
}

//blueprint of all humans
class Human{
  //class feilds or properties : variables associated to the class
  double height;
  int age;
  
  //class constructor : initialize the values of class properties 
  Human({this.height,this.age});
  
  //class methode : method associated to the class 
  void talk(String whatToSay){
    print(whatToSay);
  }
  
}