【java设计模式】【创建模式Creational Pattern】工厂方法模式Factory Method Pattern（多态性工厂模式Polymorphic Factory Pattern、虚拟构造子模式Virtual Constructor Pattern）

 public class Test {
     public static void main(String[] args){
         Creator ca=new ConcreteCreatorA();
         ca.create().doSth();
         Creator cb=new ConcreteCreatorB();
         cb.create().doSth();
     }
 }
 interface Creator{
     Product create();
 }
 class ConcreteCreatorA implements Creator{
     @Override
     public Product create() {
         return new ConcreteProductA();
     }
 }
 class ConcreteCreatorB implements Creator{
     @Override
     public Product create() {
         return new ConcreteProductB();
     }
 }
 interface Product{
     void doSth();
 }
 class ConcreteProductA implements Product{

     public ConcreteProductA(){
         System.out.println("Product A has been created.");
     }
     @Override
     public void doSth() {
         System.out.println("Product A is working……");
     }
 }
 class ConcreteProductB implements Product{
     public ConcreteProductB(){
         System.out.println("Product B has been created.");
     }
     @Override
     public void doSth() {
         System.out.println("Product B is working……");
     }
 }