This tag can be used for documenting properties declared in the primary constructor, where putting a doc comment directly before the property definition would. Primary Constructor The first way to create an object in Kotlin is by using a primary constructor. In the next sections, we’ll go over each type and associated concepts. Documents the property of a class which has the specified name. Kotlin secondary (auxiliary) class constructors (syntax, examples). In Kotlin, a class can have a primary constructor and one or more additional secondary constructors. Documents the receiver of an extension function. Sometimes you want your constructor private and only a factory method available to clients. Documents the primary constructor of a class. The main builder initializes the class while using the secondary builder to initialize the class and add some additional logic. A Kotlin class can have a limit of one main constructor, and one or more secondary builders.
Secondary Constructor: It allows you to put additional initialization logic. (when you need encapsulation) Use a factory method defined in a companion object There are two types of Constructor: Primary Constructor: It is a concise way to initialize a class. There are four visibility modifiers in Kotlin: private, protected, internal, and public. A constructor is like a special function, and it is defined by using two parantheses. Getters always have the same visibility as their properties. In Kotlin, theres a faster way of doing this, by using a constructor. Note that default values work for any function, not only for constructors Classes, objects, interfaces, constructors, and functions, as well as properties and their setters, can have visibility modifiers. Usage: val c1 = C("foo") // parameter passed explicitly (may also be useful) Define default values for parameters class C(name: String? = null) (solves your case) Define a factory method next to your class fun C(s: String) = C(s.length) Kotlin was developed under the Apache 2.0 license. Most use cases for secondary constructors are solved by one of the techniques below: A project was started in 2010 to develop the language and officially, first released in February 2016. Update: Since M11 (0.11.*) Kotlin supports secondary constructors.įor now Kotlin supports only primary constructors (secondary constructors may be supported later).
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