interface number {}  // blank type name

aspect tracecreation  // trace the creation of each number object
{
   declare parents: rational implements number;
   declare parents: complex implements number;
   // only within this aspect are these declarations effective

    private int total = 0; // private w/r to aspect

    after(number R): execution(number+.new(..)) && target(R)
    {
	System.out.println("number object of "+R.getClass()+" created");
	total++;		   
    }

    after() : execution(public static void *.main(String[]))
	{ System.out.println(total+" total numbers were created.");}
}// tracecreation

aspect control  // control who has priority.
{
    declare precedence: control, *;
    declare precedence: printing, tracecreation;
}