abstact factory

Author: code4craft

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>us.codecraft</groupId>
+    <artifactId>hello-design-pattern</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.11</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+        </dependency>
+    </dependencies>
+
+    
+</project>

src/main/java/helloworld/HelloWorld.java

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+package helloworld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public interface HelloWorld {
+
+    public String helloWorld();
+}

src/main/java/helloworld/Main.java

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+package helloworld;
+
+import helloworld.abstract_factory.AbstractFactory;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class Main {
+
+    public static void main(String[] args) {
+        HelloWorld helloWorld = AbstractFactory.factory().createHelloWorld();
+        System.out.println(helloWorld.helloWorld());
+    }
+}

src/main/java/helloworld/abstract_factory/AbstractFactory.java

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+package helloworld.abstract_factory;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class AbstractFactory {
+
+   public static HelloWorldFactory factory(){
+       return new DesignPatternHelloWorldFactory();
+   }
+
+}

src/main/java/helloworld/abstract_factory/DesignPatternHelloWorldFactory.java

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+package helloworld.abstract_factory;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class DesignPatternHelloWorldFactory implements HelloWorldFactory{
+    @Override
+    public HelloWorld createHelloWorld() {
+        return new DesignPatternHelloWorld();
+    }
+
+    class DesignPatternHelloWorld implements HelloWorld{
+
+        @Override
+        public String helloWorld() {
+            return "Hello world, Abstract Factory!";
+        }
+    }
+}

src/main/java/helloworld/abstract_factory/HelloWorldFactory.java

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+package helloworld.abstract_factory;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public interface HelloWorldFactory {
+
+    public HelloWorld createHelloWorld();
+}

src/main/java/helloworld/abstract_factory/JavaHelloWorldFactory.java

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+package helloworld.abstract_factory;
+
+import helloworld.HelloWorld;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class JavaHelloWorldFactory implements HelloWorldFactory{
+    @Override
+    public HelloWorld createHelloWorld() {
+        return new JavaHelloWorld();
+    }
+
+    class JavaHelloWorld implements HelloWorld{
+
+        @Override
+        public String helloWorld() {
+            return "Hello world, Java!";
+        }
+    }
+}

src/test/java/helloworld/abstract_factory/AbstractFactoryTest.java

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+package helloworld.abstract_factory;
+
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+/**
+ * @author yihua.huang@dianping.com
+ */
+public class AbstractFactoryTest {
+
+    @Test
+    public void testHelloWorld(){
+        HelloWorldFactory helloWorldFactory = new JavaHelloWorldFactory();
+        assertThat(helloWorldFactory.createHelloWorld().helloWorld(), is("Hello world, Java!"));
+        helloWorldFactory = new DesignPatternHelloWorldFactory();
+        assertThat(helloWorldFactory.createHelloWorld().helloWorld(), is("Hello world, Abstract Factory!"));
+    }
+
+}