JAVA-1597 Abstract Factory pattern example (#14733)

Upgraded example displaying a more complex use of the pattern

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/AbstractFactoryRunner.java

@@ -0,0 +1,8 @@
+package com.baeldung.creational.abstractfactory2;
+
+public class AbstractFactoryRunner {
+
+    public static void main(String[] args) {
+        new AnimalAbstractFactory().createAnimal(AnimalType.LAND);
+    }
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/Animal.java

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+package com.baeldung.creational.abstractfactory2;
+
+public abstract class Animal {
+    AnimalType type;
+    AnimalEra era;
+    String name;
+    Animal(AnimalType type, AnimalEra era, String name) {
+        this.type = type;
+        this.era = era;
+        this.name = name;
+    }
+    abstract void create();
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/AnimalAbstractFactory.java

@@ -0,0 +1,22 @@
+package com.baeldung.creational.abstractfactory2;
+
+public class AnimalAbstractFactory {
+
+    Animal animal;
+    Animal createAnimal(AnimalType type) {
+        AnimalEra era = getFromConfiguration();
+        switch (era) {
+        case MESOZOIC:
+            animal = new MesozoicAnimalFactory().createAnimal(type);
+            break;
+        case CENOZOIC:
+            animal = new CenozoicAnimalFactory().createAnimal(type);
+            break;
+        }
+        return null;
+    }
+
+    AnimalEra getFromConfiguration() {
+        return AnimalEra.MESOZOIC;
+    }
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/AnimalEra.java

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+package com.baeldung.creational.abstractfactory2;
+
+public enum AnimalEra {
+    MESOZOIC,
+    CENOZOIC
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/AnimalType.java

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+package com.baeldung.creational.abstractfactory2;
+
+public enum AnimalType {
+    LAND,
+    SKY
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/CenozoicAnimalFactory.java

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+package com.baeldung.creational.abstractfactory2;
+
+public class CenozoicAnimalFactory implements EraAnimalFactory{
+    @Override
+    public LandAnimal makeLandAnimal() {
+        return new LandAnimal(AnimalEra.CENOZOIC, "Mammoth");
+    }
+
+    @Override
+    public SkyAnimal makeSkyAnimal() {
+        return new SkyAnimal(AnimalEra.CENOZOIC, "Terror bird");
+    }
+
+    Animal createAnimal(AnimalType type) {
+        switch (type) {
+        case LAND:
+            return makeLandAnimal();
+        case SKY:
+            return makeSkyAnimal();
+        }
+        return null;
+    }
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/EraAnimalFactory.java

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+package com.baeldung.creational.abstractfactory2;
+
+public interface EraAnimalFactory {
+
+    LandAnimal makeLandAnimal();
+    SkyAnimal makeSkyAnimal();
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/LandAnimal.java

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+package com.baeldung.creational.abstractfactory2;
+
+public class LandAnimal extends Animal{
+
+    LandAnimal(AnimalEra era, String name) {
+        super(AnimalType.LAND, era, name);
+        create();
+    }
+    @Override
+    void create() {
+        System.out.println("Creating a " + type + " animal: " + name);
+    }
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/MesozoicAnimalFactory.java

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+package com.baeldung.creational.abstractfactory2;
+
+public class MesozoicAnimalFactory implements EraAnimalFactory{
+    @Override
+    public LandAnimal makeLandAnimal() {
+        return new LandAnimal(AnimalEra.MESOZOIC, "Tyrannosaurus Rex");
+    }
+
+    @Override
+    public SkyAnimal makeSkyAnimal() {
+        return new SkyAnimal(AnimalEra.MESOZOIC, "Pterodactylus");
+    }
+
+    Animal createAnimal(AnimalType type) {
+        switch (type) {
+            case LAND:
+                 return makeLandAnimal();
+            case SKY:
+                return makeSkyAnimal();
+        }
+        return null;
+    }
+
+}

patterns-modules/design-patterns-creational/src/main/java/com/baeldung/creational/abstractfactory2/SkyAnimal.java

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+package com.baeldung.creational.abstractfactory2;
+
+public class SkyAnimal extends Animal{
+
+    SkyAnimal(AnimalEra era, String name) {
+        super(AnimalType.SKY, era, name);
+        create();
+    }
+    @Override
+    void create() {
+        System.out.println("Creating a " + type + " animal: " + name);
+    }
+}