CS 342 - 4/7/16

Decorator Design Pattern

public abtract class Beverage
{
String descrip = "Unknown Beverage":

 public String getDescription()
    {
      return descrip;
    }

 public abstract double cost();
}

public class Espresso extends Beverage
{
  public Espresso()
   {   descrip = "Espresso"; }

  public double cost ()
   {
      return 9.78;
    }

}

public abstract class CondimentDecorator extends Beverage
{
  public abstract String getDescription ();
}

public class Mocha extend CondimentDecorator
{
  Beverage bev;

  public Mocha (Beverage bevParam)
    {  bev = bevParam; }

  public Sgtring getDescription()
    {
      return bev.getDescription() + ", Mocha";
    }

  public double cost()
    {
       return 18.95 + bev.cost();
    }
}

//
Beverage customerOrder;

   customerOrder = new Espresso();
   System.out.println ("The customer odered a " +
                          customerOrder.getDescription() +
                       " which costs $" + customerOrder.cost() );


   customerOrder = new Mocha ( customerOrder );
   System.out.println ("The customer odered a " +
                          customerOrder.getDescription() +
                       " which costs $" + customerOrder.cost() );

   customerOrder = new Cream ( customerOrder );

   customerOrder = new Sugar ( customerOrder );
   customerOrder = new Sugar ( customerOrder );

   ================================================

 public static void main(String[] args)
{

   String word;

   word = new String ("Hello");  

   method2 ( word );

   System.out.println(word);

}

public static void method2 ( String p )
{
    p = new String ("Goodbye");
}