In this Scala Tutorial, you will learn How to write your first Scala Hello World application by creating your first project and then running it.

Object is a class but it already has an instance, so you can not call new ObjectName. The object keyword creates a new singleton type, which is like a class that only has a single named instance. An object has exactly one instance (you can not call new MyObject).
You can have multiple instances of a class. Object serves the same (and some additional) purposes as the static methods and fields in Java.

object HelloWorld {
   /* This is first Scala program.  
   * This will print 'Hello World' as the output
   */
   def main(args: Array[String]) {
      println("Hello, world!") // prints Hello World
   }
}

• Save on a file named HelloWorld.scala
• Compile with scalac HelloWorld.scala (or from your IDE)
• Run with scala HelloWorld (or from your IDE)
• Generate documentation with scaladoc HelloWorld.scala
• The above code creates a singleton object
• Everything in the object is like Java’s static
• Scala doesn’t have static
• Scala does have classes; we’ll get to those later