来自:https://stackoverflow.com/A/47453161/462608

工厂

想象一下，你正在建造一座房子，你走近一个木匠，想要一扇门。 你将门的尺寸和你所需的量给他，他就为你建造一扇门。 在这种情况下，木匠是一个工厂的门。 你的规格是工厂的输入，门是工厂的输出或产品。

抽象工厂

现在，考虑同样的门的例子。 你可以去找木匠，也可以去塑料门店或PVC店。 都是门厂。 根据情况，你决定你需要接近什么样的工厂。 这就像一个抽象的工厂。

根据那个解释，我不确定下面的代码是工厂方法还是抽象工厂模式？

class PaintShape
{
public:
    static PaintShape *createShapeObject( std::string shape );

    virtual void print() { std::cout << "print PaintShape"; }
};

class PaintTriangle : public PaintShape
{
public:
    PaintTriangle() {}
    virtual void print() { std::cout << "\nprint PaintTriangle"; }
};

class PaintRectangle : public PaintShape
{
public:
    PaintRectangle() {}
    virtual void print() { std::cout << "\nprint PaintRectangle"; }
};

PaintShape* PaintShape::createShapeObject( std::string shape )
{
    if( shape == "triangle" )
        return new PaintTriangle;
    else if( shape == "rectangle" )
        return new PaintRectangle;

    return new PaintShape;
};

class EndDeveloper
{
public:
    EndDeveloper()
    {
        std::string shape;
        std::cout << "\nWhat shape would you like? ";
        // Get input from the terminal.
        std::getline( std::cin, shape );

        PaintShape *p = PaintShape::createShapeObject( shape );
        p->print();

        std::cout << "\nWhat shape would you like? ";
        std::getline (std::cin, shape);

        PaintShape *s = PaintShape::createShapeObject( shape );
        s->print();
    }
};