An abstract factory has sets of methods to make families of various objects.
In this example the AbstractSoupFactory defines the method names and return types to make various kinds of soup.
The BostonConcreteSoupFactory and the HonoluluConcreteSoupFactory both extend the AbstractSoupFactory.
An object can be defined as an AbstractSoupFactory, and instantiated as either a BostonConcreteSoupFactory (BCSF) or a HonoluluConcreteSoupFactory (HCSF). Both BCSF or HCSF have the makeFishChowder method, and both return a FishChowder type class. However, the BCSF returns a FishChowder subclass of BostonFishChowder, while the HCSF returns a FishChowder subclass of HonoluluFishChowder.
. Java Design Patterns . Java Design Patterns Abstract Factory
Java Design Patterns Abstract Factory
Abstract Factory (AKA Kit) Overview
AbstractSoupFactory.java - An Abstract Factory
abstract class AbstractSoupFactory {
String factoryLocation;
public String getFactoryLocation() {
return factoryLocation;
}
public ChickenSoup makeChickenSoup() {
return new ChickenSoup();
}
public ClamChowder makeClamChowder() {
return new ClamChowder();
}
public FishChowder makeFishChowder() {
return new FishChowder();
}
public Minnestrone makeMinnestrone() {
return new Minnestrone();
}
public PastaFazul makePastaFazul() {
return new PastaFazul();
}
public TofuSoup makeTofuSoup() {
return new TofuSoup();
}
public VegetableSoup makeVegetableSoup() {
return new VegetableSoup();
}
}
download source, use right-click and "Save Target As..." to save with a .java extension.
BostonConcreteSoupFactory.java - One of Two concrete factories extending the abstract factory
class BostonConcreteSoupFactory extends AbstractSoupFactory {
public BostonConcreteSoupFactory() {
factoryLocation = "Boston";
}
public ClamChowder makeClamChowder() {
return new BostonClamChowder();
}
public FishChowder makeFishChowder() {
return new BostonFishChowder();
}
}
class BostonClamChowder extends ClamChowder {
public BostonClamChowder() {
soupName = "QuahogChowder";
soupIngredients.clear();
soupIngredients.add("1 Pound Fresh Quahogs");
soupIngredients.add("1 cup corn");
soupIngredients.add("1/2 cup heavy cream");
soupIngredients.add("1/4 cup butter");
soupIngredients.add("1/4 cup potato chips");
}
}
class BostonFishChowder extends FishChowder {
public BostonFishChowder() {
soupName = "ScrodFishChowder";
soupIngredients.clear();
soupIngredients.add("1 Pound Fresh Scrod");
soupIngredients.add("1 cup corn");
soupIngredients.add("1/2 cup heavy cream");
soupIngredients.add("1/4 cup butter");
soupIngredients.add("1/4 cup potato chips");
}
}
download source, use right-click and "Save Target As..." to save with a .java extension.
HonoluluConcreteSoupFactory.java - Two of Two concrete factories extending the abstract factory
class HonoluluConcreteSoupFactory extends AbstractSoupFactory {
public HonoluluConcreteSoupFactory() {
factoryLocation = "Honolulu";
}
public ClamChowder makeClamChowder() {
return new HonoluluClamChowder();
}
public FishChowder makeFishChowder() {
return new HonoluluFishChowder();
}
}
class HonoluluClamChowder extends ClamChowder {
public HonoluluClamChowder() {
soupName = "PacificClamChowder";
soupIngredients.clear();
soupIngredients.add("1 Pound Fresh Pacific Clams");
soupIngredients.add("1 cup pineapple chunks");
soupIngredients.add("1/2 cup coconut milk");
soupIngredients.add("1/4 cup SPAM");
soupIngredients.add("1/4 cup taro chips");
}
}
class HonoluluFishChowder extends FishChowder {
public HonoluluFishChowder() {
soupName = "OpakapakaFishChowder";
soupIngredients.clear();
soupIngredients.add("1 Pound Fresh Opakapaka Fish");
soupIngredients.add("1 cup pineapple chunks");
soupIngredients.add("1/2 cup coconut milk");
soupIngredients.add("1/4 cup SPAM");
soupIngredients.add("1/4 cup taro chips");
}
}
download source, use right-click and "Save Target As..." to save with a .java extension.
TestAbstractSoupFactory.java - Testing the abstract factory
import java.util.Calendar;
class TestAbstractSoupFactory {
public static Soup MakeSoupOfTheDay(AbstractSoupFactory
concreteSoupFactory)
{
Calendar todayCalendar = Calendar.getInstance();
//int dayOfWeek = todayCalendar.get(Calendar.DAY_OF_WEEK);
int dayOfWeek = Calendar.TUESDAY;
if (dayOfWeek == Calendar.MONDAY) {
return concreteSoupFactory.makeChickenSoup();
} else if (dayOfWeek == Calendar.TUESDAY) {
return concreteSoupFactory.makeClamChowder();
} else if (dayOfWeek == Calendar.WEDNESDAY) {
return concreteSoupFactory.makeFishChowder();
} else if (dayOfWeek == Calendar.THURSDAY) {
return concreteSoupFactory.makeMinnestrone();
} else if (dayOfWeek == Calendar.TUESDAY) {
return concreteSoupFactory.makePastaFazul();
} else if (dayOfWeek == Calendar.WEDNESDAY) {
return concreteSoupFactory.makeTofuSoup();
} else {
return concreteSoupFactory.makeVegetableSoup();
}
}
public static void main(String[] args)
{
AbstractSoupFactory concreteSoupFactory =
new BostonConcreteSoupFactory();
Soup soupOfTheDay =
MakeSoupOfTheDay(concreteSoupFactory);
System.out.println("The Soup of the day " +
concreteSoupFactory.getFactoryLocation() +
" is " +
soupOfTheDay.getSoupName());
concreteSoupFactory =
new HonoluluConcreteSoupFactory();
soupOfTheDay =
MakeSoupOfTheDay(concreteSoupFactory);
System.out.println("The Soup of the day " +
concreteSoupFactory.getFactoryLocation() +
" is " +
soupOfTheDay.getSoupName());
}
}
download source, use right-click and "Save Target As..." to save with a .java extension.
Test Results (if run on a Tuesday)
The Soup of the day in Boston is QuahogChowder The Soup of the day in Honolulu is PacificClamChowder
UML
References
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| Comment by ayer Rate this Comment |
this is great, but...did I mis something? I couldn't find the definitions for FishChowder and ClamChowder classes... |
| Comment by Sunny Rate this Comment |
Thanks for your efforts.
|
| Comment by Boris Rate this Comment |
I just found this site, and I believe that is great. A way that might help to make this cod/design clearer would be:
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