简析三种工程模式

1、简单工厂

//实体抽象类

public abstract class Video {

    public abstract void produce();

}

//Java实体类

public class JavaVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制JAVA课程视频");

    }

}

//python实体类

public class PythonVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制Python课程视频");

    }

}

//工厂类

public class VideoFactory {

    public Video getVideo(Class c){

        Video video = null;

        try {

            video = (Video)c.newInstance();

        } catch (InstantiationException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }

        return video;

    }

//测试类

public class Test {

    public static void main(String[] args) {

        VideoFactory videoFactory = new VideoFactory();

        Video video = videoFactory.getVideo(JavaVideo.class);

        if(video==null){

            return;

        }

        video.produce();

    }

}

UML类图

2、工厂方法：关注产品等级结构

//实体抽象类

public abstract class Video {

    public abstract void produce();

}

//抽象工厂类

public abstract class VideoFactory {

    public abstract Video getVideo();

}

//Java实体类

public class JavaVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制JAVA课程视频");

    }

}

//Java工厂实体类

public class JavaVideoFactory extends VideoFactory {

    @Override

    public Video getVideo() {

        return new JavaVideo();

    }

}

//FE实体类

public class FEVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制FE课程视频");

    }

}

//FE工厂实体类

public class FEVideoFactory extends VideoFactory{

    @Override

    public Video getVideo() {

        return new FEVideo();

    }

}

//Python实体类

public class PythonVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制Python课程视频");

    }

}

//Python工厂实体类

public class PythonVideoFactory extends VideoFactory {

    @Override

    public Video getVideo() {

        return new PythonVideo();

    }

}

//测试类

public class Test {

    public static void main(String[] args) {

        VideoFactory videoFactory = new PythonVideoFactory();

        Video video = videoFactory.getVideo();

        video.produce();

 

    }

}

 

UML类图

3、抽象工厂：关注一个产品族

//抽象产品族类

public abstract class Article {

    public abstract void produce();

}

//抽象产品族类

public abstract class Video {

    public abstract void produce();

}

//抽象产品族工厂类

public interface CourseFactory {

    Video getVideo();

    Article getArticle();

}

//产品族Java实体类

public class JavaArticle extends Article {

    @Override

    public void produce() {

        System.out.println("编写JAVA课程手记");

    }

}

//产品族Java实体类

public class JavaVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制JAVA课程视频");

    }

}

//产品族Java实体工厂类

public class JavaCourseFactory implements CourseFactory {

    @Override

    public Video getVideo() {

        return new JavaVideo();

    }

 

    @Override

    public Article getArticle() {

        return new JavaArticle();

    }

}

//产品族Python实体类

public class PythonArticle extends Article {

    @Override

    public void produce() {

        System.out.println("编写Python手记");

    }

}

//产品族Python实体类

public class PythonVideo extends Video {

    @Override

    public void produce() {

        System.out.println("录制Python视频");

    }

}

//产品族Python实体工厂类

public class PythonCourseFactory implements CourseFactory{

    @Override

    public Video getVideo() {

        return new PythonVideo();

    }

 

    @Override

    public Article getArticle() {

        return new PythonArticle();

    }

}

//测试类

public class Test {

    public static void main(String[] args) {

        CourseFactory courseFactory = new PythonCourseFactory();

        Video video = courseFactory.getVideo();

        Article article = courseFactory.getArticle();  //创建对象

        video.produce();

        article.produce();  //对象执行操作

    }

}

UML类图