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. The out Keyword – In Kotlin, we can use the out keyword on the generic type which means we can assign this reference to any of its supertypes.Photo by Mr Cup / Fabien Barral on Unsplash Declaration-site variance(using in and out).Any is the supertype of all other datatypes. Invariance is the property by which a standard generic function/class already defined for a particular data type, cannot accept or return another datatype. This can be managed by the out and in keywords. By extension, generic types are invariant in Kotlin. Unlike Java, Kotlin makes arrays invariant by default. ISRO CS Syllabus for Scientist/Engineer Exam. ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.Python Backend Development with Django(Live).Android App Development with Kotlin(Live).Full Stack Development with React & Node JS(Live).Java Programming - Beginner to Advanced.Data Structure & Algorithm-Self Paced(C++/JAVA).Data Structures & Algorithms in JavaScript.Data Structure & Algorithm Classes (Live).
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