【java设计模式】【创建模式Creational Pattern】简单工厂模式Simple Factory Pattern（静态工厂方法模式Static Factory Method Pattern）

 public class Test {
     public static void main(String[] args){
         try{
             Factory.factory("A").doSth();
             Factory.factory("B").doSth();
             Factory.factory("C").doSth();
         }catch(BadProductException e){
             e.printStackTrace();
         }

     }
 }
 class Factory{
     public static Product factory(String product) throws BadProductException{
         if(product.equals("A"))
             return new ConcreteProductA();
         else if(product.equals("B"))
             return new ConcreteProductB();
         else
             throw new BadProductException("产品标识有误！");
     }
 }
 interface Product{
     void doSth();
 }
 class ConcreteProductA implements Product{
     @Override
     public void doSth() {
         System.out.println("ConcreteProductA.doSth()");
     }
 }
 class ConcreteProductB implements Product{
     @Override
     public void doSth() {
         System.out.println("ConcreteProductB.doSth()");
     }
 }
 class BadProductException extends Exception{
     public BadProductException(String msg){
         super(msg);
     }
 }