工厂方法

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/AbstractVideo.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+/**
+ * 工厂方法
+ *
+ * @author F嘉阳
+ * @date 2018-09-23 16:13
+ */
+public abstract class AbstractVideo {
+    public abstract void produce();
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/AbstractVideoFactory.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+import sun.misc.Launcher;
+
+import java.util.Collection;
+
+/**
+ * 定义一个创建产品对象的工厂接口，将实际创建工作推迟到子类当中
+ * 工厂方法抽象类，只提供契约，对于已知的逻辑可以提供默认实现
+ * <p>
+ * 提高产品与产品族的拓展性
+ * <p>
+ * JDK源码样例1：{@link java.net.URLStreamHandlerFactory#createURLStreamHandler(String)} -> {@link Launcher.Factory#createURLStreamHandler(String)}
+ * JDK源码样例2：{@link Collection#iterator()}
+ *
+ * @author F嘉阳
+ * @date 2018-09-23 16:16
+ */
+public abstract class AbstractVideoFactory {
+    public abstract AbstractVideo getVideo();
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/JavaAbstractVideoFactory.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-23 20:11
+ */
+public class JavaAbstractVideoFactory extends AbstractVideoFactory {
+    @Override
+    public AbstractVideo getVideo() {
+        return new JavaVideo();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/JavaVideo.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 具体的产品
+ *
+ * @author F嘉阳
+ * @date 2018-09-23 16:13
+ */
+@Slf4j
+public class JavaVideo extends AbstractVideo {
+    @Override
+    public void produce() {
+        log.info("生产Java视频");
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/PythonAbstractVideoFactory.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-23 20:11
+ */
+public class PythonAbstractVideoFactory extends AbstractVideoFactory {
+    @Override
+    public AbstractVideo getVideo() {
+        return new PythonVideo();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/creational/factorymethod/PythonVideo.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * 具体的产品
+ *
+ * @author F嘉阳
+ * @date 2018-09-23 16:14
+ */
+@Slf4j
+public class PythonVideo extends AbstractVideo {
+    @Override
+    public void produce() {
+        log.info("生产Python视频");
+    }
+}

src/test/java/top/fjy8018/designpattern/pattern/creational/factorymethod/AbstractVideoFactoryTest.java

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+package top.fjy8018.designpattern.pattern.creational.factorymethod;
+
+import org.junit.jupiter.api.Test;
+
+class AbstractVideoFactoryTest {
+
+    @Test
+    void getVideo() {
+        AbstractVideoFactory factory = new JavaAbstractVideoFactory();
+        factory.getVideo().produce();
+    }
+}