Java Fundamentals: Variables, Data Types & Operators 🧮
Java's foundation begins with understanding its basic building blocks: variables, data types, and operators.
Variables are containers for data. Java is statically typed, requiring you to declare a variable's data type before use.
Data Types in Java include primitive types like:
int
for integersdouble
for floating-point numberschar
for charactersboolean
for true/false values
and non-primitive types like String
, Arrays
, and user-defined objects.
Operators perform operations on variables and values, including arithmetic (+
, -
, *
, /
), relational (==
, >
, <
), and logical (&&
, ||
) operators.
Example:
int age = 25;
double price = 19.99;
boolean isActive = true;
String name = "Alice";