gistfile1.kt

import java.util.*

abstract class LivingThingy(val age : Int) {
}

trait Badass {
   public fun bark() {
       println("Wouf wouf!")
   }
}

class Puppy(name : String) : LivingThingy(12), Badass {
    var name : String = "Unknown"
        get() = $name;
        set(value) {
            $name = value
        }

    {
        this.name = name
    }

    public fun sayHello() {
        println("Hello! My name is ${this.name}.")
    }
}

fun sayHello(callback : () -> Unit) : Unit {
    callback();
}

fun register<T : Any>(module : T)  {
    println("Registering module...")
}

fun main(args: Array<String>) {
    sayHello({() -> println("Hello world!")});
    register<String>("abc");

    var puppies : List<Puppy> = ArrayList<Puppy>();
    puppies.add(Puppy("Rex"))

    for (puppy in puppies) {
        println(puppy is LivingThingy);
        puppy.bark();
        puppy.sayHello();
    }
}