【java】工厂模式Factory，利用反射改进

 package 反射;
 interface Product{
     public void produce();
 }
 class socks implements Product{
     @Override
     public void produce() {
         System.out.println("袜子被生产");
     }
 }
 /*
 class shoes implements Product{
     @Override
     public void produce() {
         System.out.println("鞋子被生产");
     }
 }
 */
 class Factory{
     private static Product product;
     public static Product getInstance(String productName){
         if(productName.equals("袜子"))
             product=new socks();
         /*每添加一个产品就得增加getInstance方法的代码，可以利用反射改写
         if(productName.equals("鞋子"))
             product=new shoes();
         */
         return product;
     }
 }
 public class TestFactory {
     public static void main(String[] args) {
         Product product=Factory.getInstance("袜子");
         product.produce();//袜子被生产
         /*
         Product product2=Factory.getInstance("鞋子");
         product2.produce();//鞋子被生产
         */
     }
 }

此代码含new耦合，有待优化。

 package 反射;
 interface Product{
     public void produce();
 }
 class socks implements Product{
     @Override
     public void produce() {
         System.out.println("袜子被生产");
     }
 }

 class shoes implements Product{
     @Override
     public void produce() {
         System.out.println("鞋子被生产");
     }
 }

 class Factory{
     private static Product product;
     public static Product getInstance(String productName) throws ClassNotFoundException, InstantiationException, IllegalAccessException{
         Class<?> cls=Class.forName(productName);
         product=(Product)cls.newInstance();
         return product;
     }
 }
 public class TestFactory {
     public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
         Product product=Factory.getInstance("反射.socks");
         product.produce();//袜子被生产

         Product product2=Factory.getInstance("反射.shoes");
         product2.produce();//鞋子被生产

     }
 }

利用反射改进