Private constructor in Kotlin
You can even do something more similar to "emulating" usage of public constructor while having private constructor.
class Foo private constructor(val someData: Data) {
companion object {
operator fun invoke(): Foo {
// do stuff
return Foo(someData)
}
}
}
//usage
Foo() //even though it looks like constructor, it is a function call
This is possible using a companion object:
class Foo private constructor(val someData: Data) {
companion object {
fun constructorA(): Foo {
// do stuff
return Foo(someData)
}
}
// ...
}
Methods inside the companion object can be reached just like if they were members of the surrounding class (e.g. Foo.constructorA()
)
See kotlin documentation here:
https://kotlinlang.org/docs/reference/classes.html#constructors
https://kotlinlang.org/docs/reference/visibility-modifiers.html#constructors
class DontCreateMe private constructor () { /*...*/ }