Definition   The FUNCTIONAL APPLICATION ARCHITECTURE is the application architecture in which:

1. all variable reference in a method are declared local to the method
   
2. all methods defined in the class,  with the notable exception of ``main,  '' are operators
   

The ``functional'' approach....  

class     static public void main (String args [])     {       double figureArea = readFigureArea ();       int nrSquares = readNrOfSquares ();       double squareArea = computeSquareArea       (figureArea,  nrSquares);       double squareSide = computeSquareSide       (squareArea);       int eeCount = computeEECount (nrSquares);       double perimeter = computePerimeter       (squareSide,  eeCount);       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 (``How many 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 compute eeCount (int ns)     {       return (ns * 2) + 2;     }       static private double perimeter     (double s,  int eeCount)     {       return s * eeCount;     }

 

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

The ``objective'' solution to the line of squares problem....  

class LineOfSquares     static public void main (String args [])   {     LineOfSquares los = new LineOfSquares ();     double p = los.perimeter ();     IO.println (``Perimeter is ``+ p);   }     / /Instance variables       private int nrSquares;       private double edgeLength;     / /Constructor       public LineOfSquares ()       {         IO.print (``How many squares?   ``);         nrSquares = IO.read_int ();         IO.print (``Area of figure?   ``);         double areaOfFigure = IO.read_double ();         double areaOfSquare = areaOfFigure /nrSquares;         edgeLength = Math.sqrt (areaOfSquare);       }       public double perimeter ()       {         return edgeLength * eeCount ();       }       private int eeCount ()       {         return (nrSquares * 2) + 2;       }   / /End LineOfSquares