Question

what are identifiers? what's the identifier forming rule of JAVA.???

Answer 1

An identifier is a name that identifies either a unique object or a unique class of objects, where the "object" or class may be an idea, physical [countable] object, or physical [non countable] substance. A Java identifier is a name given to a package, class, interface, method, or variable. It allows a programmer to refer to the item from other places in the program.