Definition     The FUNCTIONAL APPLICATION ARCHITECTURE is the application architecture which:

1. All variables referenced in a method are declared local to the method.
   
2. All methods are defined in the class,  with the notable except of the ``main method'' are operators - they return data
   

The ``Functional Approach''

class -----   {   static public void main (---)   {   double figureArea = readFigureArea ();   int nrSquares = readNumberOfSquares ();   double squareArea = areaOfOneSquare (figureArea,  nrSquares);   double squareSide = computeSquareSide (squareArea);   int eeCount = computeEECount (nrSquares);   double perimeter = computePerimeter (eeCount,  squareSide);   IO.println ( ``Perimeter =  ``+ perimeter);   / /end of main method}     static private double readFigureArea ()   {   IO.print ( ``Total Figure Area?   ``);   return IO.read_double ();   }     static private int readNrOfSquares ()   {   IO.print ( ``# of squares?   ``);   int nrOfSquares = IO.read_int ();   return nrOfSquares;   }     static private double computeSquareArea (double totalArea,  int nrSquares)   {   double sa = totalArea /nrSquares;   return sa;   }     static private double computeSquareSide (double areaOfSquare)   {   return Math.sqrt (areaOfSquare);   }     static private int computeEECount (int ns)   {   return (ns * 2) + 2;   }     static private double perimeter (int eeCount,  double s)   {   return s * eeCount;   }   }

 

Main Method Environment
figureArea - > 27.0
nrSquares - > 3
squareArea - > 9.0  

computeSquareAreaEnvrionment
parameters:
totalArea - > 27.0
nrSquares - > 3
nrSquares is different than the one defined in the main method
local variable:   sa - > 9.0  

once a method terminates the data associated with it,  the environment,  goes away.  

Definition   The OBJECTIVE APPLICATION ARCHITECTURE is the application architecture in which the ``perimeter'' object for solving the problem at hand is created from a specially tailored class.