设计模式：简单工厂模式

定义：由一个工厂对象决定创建出哪一种产品类的实例

适用场景：客户端(应用层)只知道传入工厂类的参数，对于如何创建对象不关心

package com.edward.design.pattern.creational.simplefactory;

/**
 * Created by Edward on 2018/9/1.
 */
public interface Video {

    public void produce();}

package com.edward.design.pattern.creational.simplefactory;

/**
 * Created by Edward on 2018/9/1.
 */
public class JavaVideo implements Video {
    @Override
    public void produce() {
        System.out.println("Java");
    }
}


/**
 * Created by Edward on 2018/9/1.
 */
public class VideoFactory {
 
    public Video getVideo(Class c){
        Video video = null;
 
        try {
            video = (Video) Class.forName(c.getName()).newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
 
        return video;
    }
   
//    public Video getVideo(String type){
//        if("Java".equalsIgnoreCase(type)){
//            return new JavaVideo();
//        }else if ("Python".equalsIgnoreCase(type)){
//            return new Python();
//        }else {
//            return null;
//        }
//    }
}

package com.edward.design.pattern.creational.simplefactory;

/**
 * Created by Edward on 2018/9/1.
 */
public class Test {

    public static void main(String[] args) {

        VideoFactory videoFactory = new VideoFactory();
        Video video = videoFactory.getVideo(Python.class);

        if (video != null) {
            video.produce();
        } else {
            System.out.println("nothing");
        }
    }

//        VideoFactory videoFactory = new VideoFactory();
//        Video video = videoFactory.getVideo("python");
//
//        if(video != null){
//            video.produce();
//        }else {
//            System.out.println("nothing");
//        }
//    }
}