In Kotlin, either the property must be initialized or must be declared abstract ( Visit: Kotlin Abstract Class to learn more). The class has one property isOn (defined in same way as variable), and two member functions turnOn() and turnOff(). To define a class in Kotlin, class keyword is used: Since, many houses can be made from the same description, we can create many objects from a class. Based on these descriptions we build the house. It contains all the details about the floors, doors, windows etc. We can think of class as a sketch (prototype) of a house. This article will focus on the basics to keep things simple.īefore you create objects in Kotlin, you need to define a class. You will learn about detail features of an object-oriented programming like: data encapsulation, inheritance and polymorphism as we go on. It has braking, accelerating, changing gears etc.It has current gear, two wheels, number of gear etc.You can turn on and turn off lamp (behavior).In object-oriented style of programming, you can divide a complex problem into smaller sets by creating objects. This article will focus on object-oriented style of programming in Kotlin. You will learn about these concept in later chapters. Kotlin supports features such as higher-order functions, function types and lambdas which makes it a great choice for working in functional programming style. In other words, we’ve declared the three variables in the raw type.įor simplicity, we’ll use unit test assertions to verify if we get the expected type.Kotlin supports both functional and object-oriented programming. It’s worth mentioning that Kotlin’s Any is pretty similar to Java’s Object, which means it’s the supertype of all other classes. We should note that we’ve declared the three variables using the same type: Any. Private val myPlayer: Any = Player('Jackson', 42, 100)Īs we can see, we’ve created three variables: one Int, one String, and one Player.

Private val myString: Any = 'I am a string' Next, let’s create some variables: private val myInt: Any = 42 Moreover, the Player class inherits the Person class and implements the Ranking interface. Open class Person(val name: String, val age: Int)Ĭlass Player(name: String, age: Int, val numberOfWins: Int) : Person(name, age), RankingĪs the code above shows, in the package, we’ve defined a Person class, a Ranking interface, and a Player class.

Kotlin any to object