As a first example, we will use the pretty common Hello, world! program in order to show you how to use Scala and its tools without knowing much about it. Let's open your favorite editor (this example runs on Windows 7, but can be run similarly on Ubuntu or macOS), say Notepad++, and type the following lines of code:

object HelloWorld {
  def main(args: Array[String]){ 
    println("Hello, world!")  
  } 
}

Now, save the code with a name, say HelloWorld.scala, as shown in the following figure:

Let's compile the source file as follows:

C:>scalac HelloWorld.scala
 C:>scala HelloWorld
 Hello, world!
 C:>