... 方法名和实例变量 Method Names and Instance Variables 实例变量初始化函数 Inatace Variable Initializers 实例成员变量 Instance Member Variables ...
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If you want to maintain a single instance of a variable for all instances of a class, you will use static-class member variables to do it.
如果您想为一个类的所有实例维持一个变量的实例，将会用到静态类成员变量。
Specifies that one or more declared member variables refer to an instance of a class that can raise events.
指定一个或多个已声明成员变量引用可引发事件的类的实例。
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