Thursday, 2 January 2014

Decorator Design pattern - Implementation [Ice Cream]



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Decorator Design pattern - Implementation [Ice Cream]


Decorator Design pattern - Implementation [Ice Cream] - Class Diagram

































Icecream.java

public interface Icecream
{
public String makeIcecream();
}

VanillaIcecream.java

public class VanillaIcecream implements Icecream
{

@Override
public String makeIcecream()
{
return "Vanilla Icecream";
}
}

IcecreamDecorator.java

abstract class IcecreamDecorator implements Icecream
{

protected Icecream specialVanillaIcecream;

public IcecreamDecorator( Icecream specialVanillaIcecream )
{
this.specialVanillaIcecream = specialVanillaIcecream;
}

public String makeIcecream()
{
return specialVanillaIcecream.makeIcecream();
}
}

ChocolateDecorator.java

public class ChocolateDecorator extends IcecreamDecorator
{

public ChocolateDecorator( Icecream specialIcecream )
{
super(specialIcecream);
}

public String makeIcecream()
{
return specialVanillaIcecream.makeIcecream() + addChocolate();
}

private String addChocolate()
{
return " + with chocolate";
}
}

NuttyDecorator.java

public class NuttyDecorator extends IcecreamDecorator
{

public NuttyDecorator( Icecream specialVanillaIcecream )
{
super(specialVanillaIcecream);
}

public String makeIcecream()
{
return specialVanillaIcecream.makeIcecream() + addNuts();
}

private String addNuts()
{
return " + with nuts";
}
}

DecoratorClient.java

public class DecoratorClient
{

public static void main( String args[] )
{
VanillaIcecream vanillaIcecreamObj = new VanillaIcecream();
String vanillaIcecream = vanillaIcecreamObj.makeIcecream();
System.out.println(vanillaIcecream);
String vanillaIcecreamWithNuts=new NuttyDecorator(vanillaIcecreamObj).makeIcecream();
System.out.println("\n'"+vanillaIcecreamWithNuts + "' is prepared using NuttyDecorator");
String vanillaIcecreamWithChocalate=new ChocolateDecorator(vanillaIcecreamObj).makeIcecream();
System.out.println("\n'"+vanillaIcecreamWithChocalate+ "' is prepared using ChocolateDecorator");
String vanillaIcecreamWithChocalateAndNuts=new NuttyDecorator(new ChocolateDecorator(vanillaIcecreamObj)).makeIcecream();
System.out.println("\n'"+vanillaIcecreamWithChocalateAndNuts+ "' is prepared using ChocolateDecorator and NuttyDecorator");
}

}

Output

Vanilla Icecream

'Vanilla Icecream + with nuts' is prepared using NuttyDecorator

'Vanilla Icecream + with chocolate' is prepared using ChocolateDecorator

'Vanilla Icecream + with chocolate + with nuts' is prepared using ChocolateDecorator and NuttyDecorator


See also:

  • Decorator Design pattern - Introduction
  • Decorator Design pattern - Real Time Example [Dosa]
  • Decorator Design pattern - Real Time Example [Ice Cream]
  • Decorator Design pattern - Real Time Example [Pizza]
  • Decorator Design pattern - Real Time Example [Car]
  • Decorator Design pattern - Class Diagram
  • Decorator Design pattern - Sequence Diagram
  • Decorator Design pattern - Implementation [Dosa]
  • Decorator Design pattern - Implementation [Pizza]
  • Decorator Design pattern - Implementation [Car]
  • Decorator Design pattern - Implementation [Shape]
  • Decorator Design pattern - Key Points
  • All Design Patterns Links
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