- README.md is added

- Change the name to factory is done
- Local variable type inference is used

factory/src/main/java/com/iluwatar/factory/App.java

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+/*
+ * The MIT License
+ * Copyright © 2014-2019 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.factory;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Factory is an object for creating other objects, it providing Providing a static method to 
+ * create and return objects of varying classes, in order to hide the implementation logic 
+ * and makes client code focus on usage rather then objects initialization and management.
+ * 
+ * <p>In this example the CarFactory is the factory class and it provides a static method to 
+ * create different cars.
+ */
+
+public class App {
+  
+  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+  
+  /**
+   * Program main entry point.
+   */
+  public static void main(String[] args) {
+    var car1 = CarsFactory.getCar(CarsFactory.CarType.FORD);
+    var car2 = CarsFactory.getCar(CarsFactory.CarType.FERRARI);
+    LOGGER.info(car1.getDescription());
+    LOGGER.info(car2.getDescription());
+  }
+}

factory/src/main/java/com/iluwatar/factory/Car.java

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+package com.iluwatar.factory;
+
+/**
+ * Car interface.
+ */
+public interface Car {
+  
+  public String getDescription();
+  
+}

factory/src/main/java/com/iluwatar/factory/CarsFactory.java

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+package com.iluwatar.factory;
+
+/**
+ * Factory of cars.
+ */
+public class CarsFactory {
+  
+  /**
+   * Enumeration for different types of cars.
+   */
+  static enum CarType {
+    FORD, FERRARI
+  }
+  
+  /**
+   * Factory method takes as parameter a car type and initiate the appropriate class.
+   */
+  public static Car getCar(CarType type) {
+    switch (type) {
+      case FORD: return new Ford();
+      case FERRARI: return new Ferrari();
+      default: throw new IllegalArgumentException("Model not supported.");
+    }
+  }
+}

factory/src/main/java/com/iluwatar/factory/Ferrari.java

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+package com.iluwatar.factory;
+
+/**
+ * Ferrari implementation.
+ */
+public class Ferrari implements Car {
+   
+  static final String DESCRIPTION = "This is Ferrari.";
+
+  @Override
+  public String getDescription() {
+    return DESCRIPTION;
+  }
+}

factory/src/main/java/com/iluwatar/factory/Ford.java

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+package com.iluwatar.factory;
+
+/**
+ * Ford implementation.
+ */
+public class Ford implements Car {
+
+  static final String DESCRIPTION = "This is Ford.";
+
+  @Override
+  public String getDescription() {
+    return DESCRIPTION;
+  }
+}

factory/src/test/java/com/iluwatar/factory/AppTest.java

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+package com.iluwatar.factory;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class AppTest {
+
+	@Test
+	void shouldExecuteWithoutExceptions() {
+		assertDoesNotThrow(() -> App.main(new String[]{}));
+	}
+
+}

factory/src/test/java/com/iluwatar/factory/CarsFactoryTest.java

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+package com.iluwatar.factory;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class CarsFactoryTest {
+
+	@Test
+	void shouldReturnFerrariInstance() {
+		final var ferrari = CarsFactory.getCar(CarsFactory.CarType.FERRARI);
+		assertTrue(ferrari instanceof Ferrari);
+	}
+
+}