图一是Factory Method 模式结构的类图(Class Diagram),其中: Product 定义了由factory method所创建对象的统一接口。 ConcreteProduct 具体的类,实现Product接口。 Creator 一般为抽象类,声明若干factory method(方法),由它创建类型为Product的对象。正因为它能"生产"对象,所以称为factory method。Creator也可能拥有一个方...
简单工厂(Simple Factory Pattern)工厂方法(Factory Method Pattern)抽象工厂(Abstract Factory Pattern)我们需要针对不同的业务场景,使用不同的模式,下面进行逐一阐述。 Simple Factory Pattern It is up to a factory object to decide which instance of a product class to create first:To create a interface that...
如下「进口水果」的代码,为 O'Reilly 的「C# 3.0 Design Patterns」这本书籍 [1] 第五章的 Factory Method 示例。乍看之下,我觉得它比较像 Simple Factory Pattern,因其仍将创建实例,和部分逻辑判断的工作,都集中在一个 工厂类 (Creator1 类) 去处理,导致日后要添加新功能 (多引进一个国家的水果),或要修...
如下「进口水果」的代码,为 O'Reilly 的「C# 3.0 Design Patterns」这本书籍 [1] 第五章的 Factory Method 示例。乍看之下,我觉得它比较像 Simple Factory Pattern,因其仍将创建实例,和部分逻辑判断的工作,都集中在一个 工厂类 (Creator1 类) 去处理,导致日后要添加新功能 (多引进一个国家的水果),或要修...
In the Define Design Pattern dialog box, specify the pattern name Factory Method. Keep the file name as is. Click OK to proceed.Applying Design Pattern on Class DiagramIn this section, we will try to make use of the factory method pattern to model a part of a text editor.Create...
FactoryMethodPattern 工厂方法(FactoryMethod)模式是类的创建模式,其用意是定义一个创建产品对象的工厂接口,将实际创建工作推迟到子类中。 工厂方法模式是简单工厂模式的进一步抽象和推广。由于使用了多态性,工厂方法模式保持了简单工厂模式的优点,而且克服了它的缺点。工厂方法模式又称为多态工厂模式....
Diagram source:wiki There are two major variations of the Factory Method pattern according to "Design Patterns" by Erich Gamma et al.: The case when the Creator class is anabstractclass and does not provide an implementation for the factory method it declares. ...
Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. Frequency of use: high UML class diagram participants The classes and/or objects participating in this pattern are: ...
The followingUML diagramexplains the Singleton pattern. As the above UML diagram shows, a singleton class has a single instance defined and we access it by the getInstance () method. So a singleton factory that is responsible for creating objects makes use of the getInstance method to return th...
Let us consider an application that draws different geometric shapes on the basis of clients' demand. The class diagram of the application is as shown below: Figure: Factory Method Pattern Example TheShapeFactoryclass has a static methodgetShape(), which returns theGeometricShapeobject on the basis...