The names that the programmers assign for the classes, methods,variables,objects,packages and interfaces in a java program are known as identifiers.

• A static member type is like the other static members of a class: static fields and static methods.
• A static member type is not associated with any instance of the containing class
• A static member type can access the static members of the class that contains it
• A static member type has access to all the static members of its containing type.
• Nested interfaces, enums, and annotations are implicitly static, whether or not the static keyword appears
• Any type nested within an interface or annotation is also implicitly static
• A static member type may not be defined within any other kind of nested type

The rules are :

>> It can contain digits,alphabets, underscore and dollar sign characters
>> The first character should not be a digit.
>> it can contain any number of characters.

When two methods in a class have the same name but different parameters lists, those two methods are said to be overloaded.

The elements of a BorderLayout are organized at the borders and the center of a container.