☕ Java

What Java is, why it is popular, how the JVM works, and how to run your first Java program.

Declare, initialize and use variables in Java. Primitive types, default values and variable scope.

Rules for naming identifiers, list of reserved keywords, and Java naming conventions.

Primitive vs reference types, sizes, defaults, and type casting rules in Java.

Arithmetic, relational, logical, assignment, bitwise and ternary operators — with precedence rules.

if, if-else, else-if ladder, nested if, and switch statements in Java.

for, while, do-while and enhanced for-each loops with break and continue.

Declare, initialize and access single-dimensional and 2D arrays in Java.

Define, call and overload methods. Parameters, return types and scope.

Define a class, create objects, use constructors and access instance members — the heart of OOP.