Expert Patten

        Using the UML Drawing Tool by implementing the code in Java demonstrate the Expert 

1.Design Pattern.

An Expert pattern is useful in maintaining encapsulation of information, it promotes low coupling and also provides highly cohesive classes which can cause a class to become excessively complex.

Code Implementation: 

Product Description.java:

import java.io.*;

public class ProductDescription

{

   private float price=43.89f;

   public float getPrice ()

   {

            return price;

   }

}

SalesCounter.java:

import java.io.*;

 public class SaleCounter

{

public static void main (String [] args)

                        {

float total;

Sales s=new Sales();

total=s.getTotal();

System.out.println ("Total sale is: "+total);

}

}

Sales .java:

import java.io.*;

public class Sales

{

            private float total;

            public float getTotal()

{

                        ProductDescription pd=new ProductDescription ();

                        SalesLineItem sli=new SalesLineItem ();

                        total=(pd.getPrice()*sli.getSubTotal());

                        return total;

            }

}

SalesLineItem:

public class SalesLineItem

{

private int quantity=100;

public int getSubTotal()

{

                                    return quantity;

}

}