Core Java Tutorial

Learn Core Java
From Scratch

Java is a complete object-oriented, platform-independent, high-level programming language. Master the fundamentals through advanced concepts with clear examples and real-world code.

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21+

Topics

100+

Examples

Free

Always

About Java

Java was created by James Gosling at Sun Microsystems in 1991 and officially released in 1995. Originally called Oak, it was renamed Java. It follows the Write Once, Run Anywhere (WORA) principle - Java code compiles to bytecode that runs on any platform with a JVM. Today Java powers Android apps, enterprise backends, big data tools, and much more.

Prerequisites

Basic understanding of any programming language like C or C++ is helpful but not required.

Audience

Designed for students and software developers who want to learn Java from the ground up.

What You'll Learn

OOP, Collections, Generics, Multithreading, Java 8+ features, and modern best practices.

Tools Needed

JDK 21+, any IDE (IntelliJ IDEA, Eclipse, VS Code), or use our online Java compiler.

Tutorial Topics

Why Learn Java?

Platform Independent - Write once, run anywhere via JVM.
Object-Oriented - Everything is an object, making code modular and reusable.
Strongly Typed - Catches errors at compile time, not runtime.
Huge Ecosystem - Spring, Hibernate, Maven, Gradle, and thousands of libraries.
High Demand - One of the most in-demand languages for enterprise and Android development.
Modern Features - Records, sealed classes, pattern matching, virtual threads (Java 21+).