Identifiers: Names for the things you will refer to in your programs Used for programming entities as variables, constants, methods, classes, and packages Rules for naming identifiers: A sequence of characters that consists of letters, digits, underscores (_), and dollar signs ($). Cannot start with a digit. Cannot be a reserved word. Cannot be true, false, or null. An identifier can be of any length.
.Variables & Constants
Variables: used to store data in a program datatype variableName; datatype variable1, variable2, ..., variablen; Constants Represents permanent data...