the singleton pattern is shown in figure 5 singleton模式如图5所示。
class an implementation of the singleton pattern, as only one instance of the 类成为单体模式的实现,因为在应用程序中只存在
we do this by applying the singleton pattern and creating a new class, commandfactory, as the singleton 既然我们已经访问了业务层,就需要建立commandfactory类。我们通过应用singleton模式,创造一个新类commandfactory。
to facilitate this, the plug-in class implements the singleton pattern : it stores a reference to itself in a private class variable 为了使这一点更方便,插件类实现单模式(singletonpattern):它在私有类变量中存储一个自身的引用。
classes definitions can now include static members ( properties ), accessible via the class . common usage of static members is in the singleton pattern 类定义现在包含了静态成员(属性)的定义,并通过类访问它们。通常静态成员用于单独的部分。