Classes_In_Dart_Lesson_10.dart

void main() { 
  
  var apple = FoodClass();
  apple.name = "Apple";
  apple.color = "Red";
  apple.calories = 100;
  apple.isNatural = true;
  
  print("${apple.name}, ${apple.calories}, ${apple.isNatural}, ${apple.color}");
  
  var banana = FoodClass();
  banana.name = "Banana";
  banana.color = "Yellow";
  banana.calories = 150;
  banana.isNatural = true;
  
  print("${banana.name}, ${banana.calories}, ${banana.isNatural}, ${banana.color} ");
}

class FoodClass{
  
  var name;
  var isNatural;
  var isDrink;
  var color;
  var calories;
  
}

Constructors_In_Dart_Lesson_10.dart

void main() { 
  
  var apple = FoodClass("Apple",
                       true,
                       false,
                       "Red",
                       100);
  
  print("${apple.printValues()}");
}

class FoodClass{
  
  var name;
  var isNatural;
  var isDrink;
  var color;
  var calories;
  
  String printValues(){
    return "$name, $isNatural, $isDrink, $color, $calories";
  }
  
  FoodClass(String name, 
            bool isNatural, 
            bool isDrink, 
            String color, 
            int calories){
    this.name = name;
    this.isNatural = isNatural;
    this.isDrink = isDrink;
    this.color = color;
    this.calories = calories;
    
  }
  
}