We can have multiple data types in a collection. If we use "Any", we can mix and match the data types, which means There should not be any mix and match between the When we define a collection with " *", it should contain the object of In this article, we will demonstrate the difference between " *" and " Any" keywords in Kotlin. There are many ways in which we can define generics in Kotlin. Every Kotlin class has as a superclass.In any programming language, generics are a powerful feature using which developers can create custom data type to manipulate a program in a different manner.
It differs to Javas Object in 2 main things: In Java, primitives types arent type. In that example, our new class was not specifically derived from a base class (though in practice, all Kotlin classes are ultimately derived from the Any. AnyĪny in Kotlin is on the top of the hierarchy. In Kotlin the Any type represents the super type of all non-nullable types. Note that Nothing is a subtype of Unit, that's why the first compile but not the last one. Or, if you prefer, is the result value of any statement (for example println()). This is similar to the Object class in Java. The Unit type in Kotlin is the equivalent to the void type in Java. Any is an open class and by default the superclass for all the classes, whether we define it explicitly or not. We will look in detail at Unit, Nothing, and Any, and compare against their Java corresponding classes.įinally, we also consider null and how types ending with ? fit into these categories.
To take full advantage of the Kotlin Type Hierarchy, it is essential to understand how these three special types work. It is also quite close to the Java Type System, so the interoperability is excellent.ĥ Things You Will Like in Kotlin as a Java Developer
One of the reasons is its Type Hierarchy, which is both very easy to work with and extremely powerful. It should be apparent, even to the casual reader of this blog, that I really like Kotlin as a language. String of pearls How to Take Advantage of Kotlin Special Types
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