// Lang_10 [immutable objects].nova


// The application class.
class ImmutableObjectsApp
{
   // Application class's "main" function.
   public static void main( String[] args )
   {
      // When a new Integer (primitve wrapper) object is created it is immutable (fixed value).
      Integer i = new Integer( 1 );

      // Output the value of the Integer object at the local reference i.
      Stream.writeLine( "value of i before: " + i.toString( ) );

      // Call the static method.
      method1( i );

      // Output the final value of the Integer object at the local reference i.
      Stream.writeLine( "value of i after: " + i.toString( ) );
   }


   // Method to demonstrate passing an argument by reference.
   private static void method1( Integer j )
   {
      // This will reassign a new incremented object to local j but the original i is immutable.
      j++;

      // This will create a new Integer object and add it to local j,
      // then assign the result (which is also a new Integer object) to j.
      j += new Integer( 100 );

      // Output the final value of the Integer object at the local reference j.
      Stream.writeLine( "local value of j: " + j.toString( ) );
   }
}