Keywords

Keywords are language specific and cannot be used for any other purpose other than they are intended for.

Example of Java keywords: class, int, public, static, void etc.

Identifiers

Identifiers are used to identify classes, variables, constants etc.

Identifiers must start with a letter

Class 1 // NOT allowed

{}

class One // OK

{}

() used to contain lists of parameters in method, surrounding cast

types, expressions in control statement

{} defining a block of code for classes, methods etc

[ ] used to declare array types

; terminating statements

, separate identifiers, chain statements inside for statement

. used to indicate a method or variable in a object