static-methods

How do you define a static extension method in Kotlin? Is this even possible? I currently have an extension method as shown below. public fun Uber.doMagic(context: Context) { // ... } The above extension can be invoked on an instance. uberInstance.doMagic(context) // Instance method but how do I make it static method like shown below. Uber.doMagic(context) // Static or class method To achieve Uber.doMagic(context) , you can write an extension to the companion object of Uber (the companion object declaration is required): class Uber { companion object {} } fun Uber.Companion.doMagic(context:

Here I am creating an online application that depends only on Internet. So whenever there is a network error it must notify user. For that, I have created a BroadcastReciver that receives call when network connection gets lost(Internet). All this works perfectly. Now what I need is that I have to call a method of Activity from this Broadcast Receiver, where I have created an Alert Dialogue. I have read many answers on stack-overflow.com that I can declare that method static and call by using only Activity name, e.g MyActivityName.myMethod() But I can't declare my method static, because I am

I'm new to mock objects, but I understand that I need to have my classes implement interfaces in order to mock them. The problem I'm having is that in my data access layer, I want to have static methods, but I can't put a static method in an interface. What's the best way around this? Should I just use instance methods (which seems wrong) or is there another solution? Grundlefleck I would use a method object pattern. Have a static instance of this, and call it in the static method. It should be possible to subclass for testing, depending on your mocking framework. i.e. in your class with the

So far I have the following code: import java.util.Scanner; public class HallLanceMemoryCalculator { private double currentValue; public static int displayMenu(){ Scanner input=new Scanner(System.in); int choice=0; while(choice<1||choice>5){ System.out.println("1.Add"); System.out.println("2.Subtract"); System.out.println("3.Multiply"); System.out.println("4.Divide"); System.out.println("5.Clear"); System.out.println("What would you like to do?"); choice=input.nextInt(); } return choice; } public static double getOperand(String prompt){ Scanner input=new Scanner(System.in); System.out.println(

I have a static method [Method1] in my class, which calls another method [Method2] in the same class and is not a static method. But this is a no-no. I get this error: An object reference is required for the non-static field, method, or property "ClassName.MethodName()" Can someone please briefly describe why? including other things that might be related to this. A non-static method requires an instance of the class. Unless you have passed in an instance, or created an instance in your method, you cannot call a non-static method, as you have no idea what instance of the class that method