一般不做，因为静态变量不能有作用域，即它只是整个类的一个(读取应用程序)，因此没有意义因为每个实例都会尝试根据当前范围将其设置为新值.

Not done in general because a static variable cannot have a scope, i.e. it's just one for the whole class (read application) and therefore it doesn't make sense since every instance would try to set it to a new value based on the current scope.