Java Tutorial for Complete Beginners 2026

Define a class as a blueprint, create methods for object behavior, and use main as the entry point to execute a calculator's greet user method.

Explains static and non-static methods and variables, showing that static methods can be called using the class name without an object, while non-static methods require an instance.

Learn how to define and call functions (methods) in java, create objects, and use the main method as the program entry point to run and test basic return-type methods.

Learn how to pass parameters to a Java method by declaring types and variable names, then call it with x and y to get z as x plus y (150).

Define a method that returns a value and specify its return type. Call it via an object, store the result, and print it, as shown with a sum of 30.

Master Java for loops by applying initialization, condition, and update. See how the loop starts at one, runs while i is less than or equal to five, increments i, and prints 1 to 5.

Learn how the while loop in Java repeats a block of code while a condition is true and prints numbers 1 through 5.

Explore how Java's do-while loop guarantees at least one execution and checks the condition after the first run, for complete beginners.

Discover Java arrays, a fundamental concept that stores multiple values of the same type, initializes by size or inline values, and uses index-based access and loops.

Compare using a traditional for loop with an index and a for-each loop to iterate an array, print elements, and understand syntax simplification from index-based access to value-based iteration.

Learn to define strings with literals or the Java string object, and manipulate them using length, to lowercase, to uppercase, character at, substring, contains, and replace.

Learn single-level inheritance in java using the extends keyword to model a manager as a subclass of employee, accessing both parent and child properties.

Explore multi-level inheritance in Java by modeling an employee, a manager, and a project manager to show how attributes flow through a parent, child, and grandchild class.

Explore how the vehicle interface defines start and stop methods, and how car, bus, and bike implement these methods with the implements keyword and override annotations.

Explain abstraction in Java by hiding complex details and exposing essential features through abstract classes and interfaces, using an animal blueprint with abstract sound overridden by dog and cat.

Explore polymorphism in java, covering compile-time (static) polymorphism via overloading and runtime (dynamic) polymorphism via method overriding with inheritance, upcasting, and the @Override annotation.