Static variables are common to all the objects of a class. 

If a new object is created, there is no need to test the value of static variable.

Any code that uses static variable can be in any state. 

It can be within a new object or at a class level. 

So the scope of static variable is open ended in a Java class.

If we want tighter control on scope, then variables should be created at the object creation level.

Also defining static variables is not a good practice because they go against the principles of Object Oriented Programming.

https://www.geeksforgeeks.org/g-fact-47/