static void Main(string[] args) { Car car = new Car(); car.numberOfWheel = 4; car.honk(); Console.WriteLine(car.color); Console.WriteLine(car.numberOfWheel); /** * Why Encapsulation? * * Better control of class members (reduce the possibility of yourself (or others) to mess up the code) * Fields can be made read-only (if you only use the get method), or write-only (if you only use the set method) * Flexible: the programmer can change one part of the code without affecting other parts * Increased security of data * */ Person person = new Person(); person.Name = "Lam"; Console.WriteLine(person.Name); person.Birthday = "20/01/2020"; Console.WriteLine(person.Birthday); // Polymorphism and Overriding Methods Animal animal = new Animal(); Animal pig = new Pig(); Animal dog = new Dog(); animal.animalSound(); pig.animalSound(); dog.animalSound(); // Abstract Classes and Methods Saitama saitama = new Saitama(); saitama.sayHi(); saitama.attack(); // Interface Banana banana = new Banana(); banana.makeIn(); // Multiple Interfaces DemoClass demoClass = new DemoClass(); demoClass.myMethod(); demoClass.myOtherMethod(); }