我知道有很多关于这两种模式之间差异的帖子,但有一些东西我找不到。

From what I have been reading, I see that the factory method pattern allows you to define how to create a single concrete product but hiding the implementation from the client as they will see a generic product. My first question is about the abstract factory. Is its role to allow you to create families of concrete objects in (that can depend on what specific factory you use) rather than just a single concrete object? Does the abstract factory only return one very large object or many objects depending on what methods you call?

我最后两个问题是关于一句我在很多地方都见过的引语,我不能完全理解:

两者之间的一个区别是 使用抽象工厂模式,a 类委托的责任 对象实例化到另一个对象 通过合成,而工厂 方法模式使用继承和 类依赖于子类来处理 所需的对象实例化。

我的理解是,工厂方法模式有一个Creator接口,它将使ConcreteCreator负责知道要实例化哪个ConcreteProduct。这就是使用继承来处理对象实例化的意思吗?

现在,关于引用,抽象工厂模式是如何通过组合将对象实例化的责任委托给另一个对象的?这是什么意思?在我看来,抽象工厂模式似乎也使用继承来完成构造过程,但我仍然在学习这些模式。

任何帮助,特别是最后一个问题,将非常感激。


当前回答

有相当多的定义。基本上,描述工厂模式的三种常用方法是

简单的工厂

基于条件的简单对象创建方法/类。

工厂方法

使用子类提供实现的工厂方法设计模式。

抽象工厂

抽象工厂设计模式产生相关或依赖的对象族,而不指定它们的具体类。

下面的链接非常有用-工厂比较-重构。guru

其他回答

abstract factory design pattern with realtime example: what is an abstract factory design pattern? It is similar to the factory method design pattern. we need to use this pattern when we have multiple factories. there will be a grouping of factories defined in this pattern. factory method pattern is a subset of abstract factory design pattern. They have the same advantages as factory patterns. abstract factory relies on object composition whereas the factory method deals with inheritance. factory design pattern in java with a realtime example: what is the factory design pattern? it is mostly used design in object-oriented programming. It is one of the creational patterns. it is all about creating instances. Clients will create the object without exposed to object creational logic. it is widely used in different frameworks ex: the spring framework. we use this pattern when the class doesn’t know the objects of another it must create. Realtime example: when our car breaks down on the road. We need to inform the repairman about what type of vehicle we are using so that repairman will carry tools to fix the repair. as per our input, the repairman will fix the issue and make it ready for us to travel again. There are a few built-in methods that use these patterns. example getInstance() method in JavaUtilcalendar class. With help of getInstance(), we can get objects whenever we execute this method. Javautilcalendar : getInstance() is method return object. https://trendydevx.com/factory-design-pattern-in-java-with-realtime-example/

抽象工厂:工厂中的工厂;将独立但相关/依赖的工厂分组在一起,而不指定它们的具体类的工厂。 抽象工厂实例

Factory:它提供了一种将实例化逻辑委托给子类的方法。 工厂模式示例

工厂设计模式

generation 1 <- generation 2 <- generation 3
//example
(generation 1) shape <- (generation 2) rectangle, oval <- (generation 3) rectangle impressionism, rectangle surrealism, oval impressionism, oval surrealism

工厂

用例:实例化第2代的一个对象

这是一种创造模式,允许你在一个简单的地方创建第2代。它符合SRP和OCP -所有的更改都在一个类中进行。

enum ShapeType {
    RECTANGLE,
    OVAL
}

class Shape {}

//Concrete Products
//generation 2
class Rectangle extends Shape {}
class Oval extends Shape {}

//Factory
class Factory {
    Shape createShape(ShapeType type) {

        switch (type) {
            case RECTANGLE:
                return new Rectangle();
            case OVAL:
                return new Oval();
        }
    }
}

//Creator
class Painter {

    private Factory factory;

    Painter(Factory factory) {
        this.factory = factory;
    }

    Shape prepareShape(ShapeType type) {
        return factory.createShape(type);
    }
}

//using
class Main {
    void main() {
        Painter painter = new Painter(new Factory());

        Shape shape1 = painter.prepareShape(ShapeType.RECTANGLE);
        Shape shape2 = painter.prepareShape(ShapeType.OVAL);
    }
}

工厂方法

用例:实例化第3代的一个对象

有助于与下一代家庭成员合作。每个画家都有自己的风格,印象派、超现实主义……工厂方法使用抽象创造者作为工厂(抽象方法),具体创造者是这种方法的实现

enum ShapeType {
    RECTANGLE,
    OVAL
}

class Shape {}

//Concrete Products
//generation 2
class Rectangle extends Shape {}
class Oval extends Shape {}

//generation 3
class RectangleImpressionism extends Rectangle {}
class OvalImpressionism extends Oval {}
class RectangleSurrealism extends Rectangle {}
class OvalSurrealism extends Oval {}

//Creator
abstract class Painter {

    Shape prepareShape(ShapeType type) {
        return createShape(type);
    }

    //Factory method
    abstract Shape createShape(ShapeType type);
}

//Concrete Creators
class PainterImpressionism {

    @override
    Shape createShape(ShapeType type) {
        switch (type) {
            case RECTANGLE:
                return new RectangleImpressionism();
            case OVAL:
                return new OvalImpressionism();
        }
    }
}

class PainterSurrealism {

    @override
    Shape createShape(ShapeType type) {
        switch (type) {
            case RECTANGLE:
                return new RectangleSurrealism();
            case OVAL:
                return new OvalSurrealism();
        }
    }
}

//using
class Main {
    void main() {
        Painter painterImpressionism = new PainterImpressionism();
        Shape shape1 = painterImpressionism.prepareShape(ShapeType.RECTANGLE);

        Painter painterSurrealism = new PainterSurrealism();
        Shape shape2 = painterSurrealism.prepareShape(ShapeType.RECTANGLE);
    }
}

抽象工厂

用例:实例化第3代的所有对象

工厂是抽象工厂和具象工厂的一部分


//Concrete Products
//generation 2
class Rectangle extends Shape {}
class Oval extends Shape {}

//generation 3
class RectangleImpressionism extends Rectangle {}
class OvalImpressionism extends Oval {}
class RectangleSurrealism extends Rectangle {}
class OvalSurrealism extends Oval {}

//Abstract Factory
interface Factory {
    Rectangle createRectangle();
    Oval createOval();
}

//Concrete Factories
class ImpressionismFactory implements Factory {
    @Override
    public Rectangle createRectangle() {
        return new RectangleImpressionism();
    }

    @Override
    public Oval createOval() {
        return new OvalImpressionism();
    }
}

class SurrealismFactory implements Factory {
    @Override
    public Rectangle createRectangle() {
        return new RectangleSurrealism();
    }

    @Override
    public Oval createOval() {
        return new OvalSurrealism();
    }
}

//Creator
class Painter {

    Rectangle rectangle;
    Oval oval;

    Painter(Factory factory) {
        rectangle = factory.createRectangle();
        rectangle.resize();

        oval = factory.createOval();
        oval.resize();
    }
}

//using
class Main {
    void main() {
        Painter painter1 = new Painter(new ImpressionismFactory());
        Shape shape1 = painter1.rectangle;
        Shape shape2 = painter1.oval;

        Painter painter2 = new Painter(new ImpressionismFactory());
        Shape shape3 = painter2.rectangle;
        Shape shape4 = painter1.oval;
    }
}

为了便于理解,考虑这个例子。

电信公司提供什么?例如宽带,电话线和移动电话,你被要求创建一个应用程序,向他们的客户提供他们的产品。

一般来说,你在这里要做的是,通过你的工厂方法创建产品,即宽带,电话线和手机,在那里你知道你为这些产品拥有什么属性,这是非常简单的。

现在,该公司想要为他们的客户提供他们的产品捆绑,即宽带、电话线和移动设备,而抽象工厂就来了。

换句话说,抽象工厂是由其他工厂组成的,他们负责创造自己的产品,抽象工厂知道如何在自己的责任方面把这些产品放在更有意义的地方。

在这种情况下,BundleFactory是抽象工厂,BroadbandFactory, PhonelineFactory和MobileFactory是工厂。为了进一步简化,这些工厂将使用工厂方法初始化各个产品。

运行下面的代码示例:

public class BroadbandFactory : IFactory {
    public static Broadband CreateStandardInstance() {
        // broadband product creation logic goes here
    }
}

public class PhonelineFactory : IFactory {
    public static Phoneline CreateStandardInstance() {
        // phoneline product creation logic goes here
    }
}

public class MobileFactory : IFactory {
    public static Mobile CreateStandardInstance() {
        // mobile product creation logic goes here
    }
}

public class BundleFactory : IAbstractFactory {

    public static Bundle CreateBundle() {
        broadband = BroadbandFactory.CreateStandardInstance();
        phoneline = PhonelineFactory.CreateStandardInstance();
        mobile = MobileFactory.CreateStandardInstance();

        applySomeDiscountOrWhatever(broadband, phoneline, mobile);
    }

    private static void applySomeDiscountOrWhatever(Broadband bb, Phoneline pl, Mobile m) {
        // some logic here
        // maybe manange some variables and invoke some other methods/services/etc.
    }
}

希望这能有所帮助。

现实生活中的例子。(容易记)

工厂

想象一下,你正在建造一所房子,你找一个木匠开一扇门。你给他门的尺寸和你的要求,他就会为你造一扇门。在这种情况下,木匠是门的工厂。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。他们都是门厂。根据情况,你决定你需要接触什么样的工厂。这就像一个抽象工厂。

我在这里解释了工厂方法模式和抽象工厂模式,从不使用它们来解释问题开始,然后通过使用上述模式来解决问题 https://github.com/vikramnagineni/Design-Patterns/tree/master