【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……");
    }
}