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How do I access a private static method?
You can not access Private methods outside the class which defines this method. You should make it Public to give full access to any classes or protected to give access to all the classes in the same package. Click [here] http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html For more reference.
What is the benefit of having static field?
Essentially, static methods let you write procedural code in an object oriented language. It lets you call methods without having to create an object first. The only time you want to use a static method in a class is when a given method does not require an instance of a class to be created.
When do I use public / private / static methods?
Protected is something that involves the openness to reimplementation. Avoid, if you can, deeply nested inheritances. You risk making things very difficult to handle, as your reimplementation class can screw the base class. Technically, a class should declare an interface (public) and an implementation (private).
Are there any advantages to using static methods?
As has already been stated, there are many advantages to static methods. However; keep in mind that they will live on the heap for the life of the application.
What is the use of private static member functions?
By making it private, they are saying that you (as a client) should not try to use it. It either does not do what you think it does, or is implemented in a very constrained, controlled way. @Mark Ransom’s answer brings up a good point for the practical use of a private static member function.
Do you need to pass this pointer to static methods?
Yes, the compiler does not need to pass the implicit this pointer to static methods. Even if you don’t use it in your instance method, it is still being passed. It’ll be slightly quicker as there is no this parameter passed (although the performance cost of calling the method is probably considerably more than this saving).