Factory Method

src/main/java/com/dongho/df/domain/creational/factory_method/ConcreteProductA.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public class ConcreteProductA implements Product {
+
+    @Override
+    public String getProductName() {
+        return "concreteProductA";
+    }
+
+}

src/main/java/com/dongho/df/domain/creational/factory_method/ConcreteProductACreator.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public class ConcreteProductACreator extends Creator {
+
+    @Override
+    protected Product createProduct() {
+        return new ConcreteProductA();
+    }
+
+}

src/main/java/com/dongho/df/domain/creational/factory_method/ConcreteProductB.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public class ConcreteProductB implements Product {
+
+    @Override
+    public String getProductName() {
+        return "concreteProductB";
+    }
+
+}

src/main/java/com/dongho/df/domain/creational/factory_method/ConcreteProductBCreator.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public class ConcreteProductBCreator extends Creator {
+
+    @Override
+    protected Product createProduct() {
+        return new ConcreteProductB();
+    }
+}

src/main/java/com/dongho/df/domain/creational/factory_method/Creator.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public abstract class Creator {
+
+    abstract protected Product createProduct();
+
+    public String foo() {
+        Product product = createProduct();
+        return product.getProductName();
+    }
+
+}

src/main/java/com/dongho/df/domain/creational/factory_method/Product.java

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+package com.dongho.df.domain.creational.factory_method;
+
+public interface Product {
+
+    public String getProductName();
+
+}

src/test/java/com/dongho/df/domain/creational/factory_method/FactoryMethodTest.java

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+package com.dongho.df.domain.creational.factory_method;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(JUnit4.class)
+public class FactoryMethodTest {
+
+    @Test
+    public void concreteProductATest() {
+        Creator creator;
+        String productName;
+
+        given: {
+            creator = new ConcreteProductACreator();
+        }
+
+        when: {
+            productName = creator.foo();
+        }
+
+        then: {
+            assertThat(productName).isEqualTo("concreteProductA");
+        }
+
+    }
+
+    @Test
+    public void concreteProductBTest() {
+        Creator creator;
+        String productName;
+
+        given: {
+            creator = new ConcreteProductBCreator();
+        }
+
+        when: {
+            productName = creator.foo();
+        }
+
+        then: {
+            assertThat(productName).isEqualTo("concreteProductB");
+        }
+
+    }
+
+}