【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);
    }
}