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.

youdao

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.

youdao

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.

youdao

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.

youdao

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.

youdao