getInstance.md

Calling a class object member from Java:

public class Engine private() {
    class object {
        public fun getInstance(): Engine = Engine()
    }
}

Option 1: class object is an object, so you can access its members as instance methods through a static constant:

// Java
Engine.OBJECT$.getInstance()

Option 2: use [platformStatic] annotation:

public class Engine private() {
    class object {
        [platformStatic]
        public fun getInstance(): Engine = Engine()
    }
}

Then, this method becomes static (the previous option still works):

// Java
Engine.getInstance()

More details: http://kotlinlang.org/docs/reference/java-interop.html