Are object reference variables static?
The only way you can access an object is through a reference variable. Reference variables can be declared as static variables, instance variables, method parameters, or local variables. A reference variable that is declared as final can’t never be reassigned to refer to a different object.
What if static variable refers to an object?
Static Variables: When a variable is declared as static, then a single copy of the variable is created and shared among all objects at a class level. Static variables are, essentially, global variables. All instances of the class share the same static variable.
Why can I only access static members from a static function?
The non-static data, however, is dependent on a specific object (instantiation) of the class. Since you can’t be sure that there are any objects instantiated when calling a static function, it is illogical (and therefore not allowed) to access non-static data from it.
Can a non static member reference be in a static method?
In C++ you can not access a non static class member from a static method. Make it a normal method and try like below:- You need to make getMessage non-static or you need to make pub static. Probably what you really need to do is rethink your design.
Why does an object reference need a static keyword?
It is not the reference that matters, a reference is for you to know what instances your dealing with. static members work like this; they are part of a class, but they are not part of an instance derived from that class. I understand this is the way it works. But I want to know the basic concept to why Static keyword was required at all?
How to avoid using objects to access static variables?
“Avoid using an object to access a class (static) variable or method. Use a class name instead…” At first glance, it looks like the last line is requesting that workerThread sleep for five seconds. However, the Thread.sleep method is actually static, and makes the current thread sleep.