What is static variable and static method?
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Answer Posted / santosh
Ordinarily, when you create a class you are describing how
objects of that class look and
how they will behave. You don’t actually get anything until
you create an object of that
class with new, and at that point data storage is created
and methods become available.
But there are two situations in which this approach is not
sufficient. One is if you want to
have only one piece of storage for a particular piece of
data, regardless of how many objects
are created, or even if no objects are created. The other
is if you need a method that isn’t
associated with any particular object of this class. That
is, you need a method that you can
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call even if no objects are created. You can achieve both
of these effects with the static
keyword. When you say something is static, it means that
data or method is not tied to any
particular object instance of that class. So even if you’ve
never created an object of that class
you can call a static method or access a piece of static
data. With ordinary, non-static data
and methods you must create an object and use that object
to access the data or method,
since non-static data and methods must know the particular
object they are working with.
Of course, since static methods don’t need any objects to
be created before they are used,
they cannot directly access non-static members or methods
by simply calling those other
members without referring to a named object (since non-
static members and methods must
be tied to a particular object).
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