![]() However, the productivity and the ease of coding needs to be improved with time to compete with evolved technology. Where it was user-friendly on the other hand, it also increased the productivity of the developers with new functions and libraries. No need of a return statement.Java used to be the most convenient language for the Android developers for building apps. Unit is a type and therefore can be used as a type argument.The main characteristics of Unit against Java’s void are: In Java if we want that a function does return nothing we use void, Unit is the equivalent in Kotlin. methods toString, equals and hasCode are inherited from Any while to use wait and notify you will need to cast your variable to Object to use them. Any can’t hold the null value, if you need null to be part of your variable you can use the type Any?.In Java, primitives types aren’t type of the hierarchy and you need to box them implicitly, while in Kotlin Any is a super type of all types.It differs to Java’s Object in 2 main things: ![]() In Kotlin the Any type represents the super type of all non-nullable types. Object is the root of the class hierarchy in Java, every class has Object as a superclass. We will see here how Kotlin represent these types and how it improves them. Java has Object to represent the root of the class hierarchy and voidto represent the lack of a type. Photo by Mr Cup / Fabien Barral on Unsplash
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