In a Kotlin program, which lines can be marked with a label

All classes in Kotlin inherit from which superclass?

You have written a function, sort(), that should accept only collections that implement the Comparable interface. How can you restrict the function? fun sort(list: List): List { return list.sorted()}

Kotlin classes are final by default. What does final mean?

You have created an array to hold three strings. When you run the code bellow, the compiler displays an error. Why does the code fail? val names = arrayOf(3) names[3]= "Delta"

If a class has one or more secondary constructors, what must each of them do?

Which line of code shows how to display a nullable string's length and shows 0 instead of null?

This code does not print any output to the console. What is wrong? firstName?.let { println("Greeting $firstname!")}

The function typeChecker receiver a parameter obj of type Any. Based upon the type of obj, it prints different messages for Int, String, Double, and Float types; if not any of the mentioned types, it prints "unknown type". What operator allows you to determine the type of an object?

You are attempting to assign an integer variable to a long variable, but Kotlin compiler flags it as an error. Why?

You have started a long-running coroutine whose job you have assigned to a variable named task. If the need arose, how could you abort the coroutine? val task = launch { // long running job}