Java Variables & Literals

Variables

A variable is a named container that holds a value of a specific type, declared as type name = value;, for example: int age = 25;

Literals

A literal is the fixed value itself written directly in code — 25 is an integer literal, "Hello" is a String literal, and true is a boolean literal.

Variable Naming Rules

Names must start with a letter, underscore, or dollar sign, cannot use Java reserved keywords, and by convention use camelCase (e.g., userName).