当提供静态成员变量时，总是提供一个静态构造函数。
Always provide a static constructor when providing static member variables.
在创建一个类型的任何实例之前，应该初始化其中的静态成员变量。
You know that you should initialize static member variables in a type before you create any instances of that type.
当你有更复杂的逻辑来初始化静态成员变量时，请创建静态构造函数。
When you have more complicated logic to initialize static member variables, create a static constructor.
通过在子类中增加一个静态同步方法来试图保护父类中的静态成员变量是无效的。
It is not effective to add a new static synchronized method in a subclass that attempts to protect static fields declared in a superclass.
不鼓励通过实例变量来使用静态成员。
Using a static member through an instance variable should be discouraged.
我把数字变成是Classifier 2类中的成员变量，这将允许我避免将其作为参数传递给一大堆静态方法。
I've made the number a member variable within the Classifier2 class, which allows me to avoid passing it around as a parameter to a bunch of static methods.
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。
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.
你回答你的问题基本。静态变量（一个函数或者类的成员变量或局部变量）是只初始化一次，终止。例如；
So as you see although we call foo function three times the initialization of a static varible is done only once.
如果静态成员是一个变量，然后你可以改变它的值。
If the Static member is a mutable variable, then you can certainly change it's value.
如果静态成员是一个变量，然后你可以改变它的值。
If the Static member is a mutable variable, then you can certainly change it's value.
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