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Welcome to the iwantcoding.com Java Tutorial. Java is the workhorse of enterprise software: statically typed, object-oriented, GC-managed, and battle-tested across decades of production code. Java compiles to bytecode and runs on the JVM — the same code, the same way, everywhere.
What this tutorial covers
| Chapter | You will learn |
|---|---|
| Java Basics | Syntax, variables, data types, operators, strings, math, control flow, loops, arrays, methods. |
| OOP | Classes, constructors, access modifiers, inheritance, polymorphism, abstracts, interfaces, enums, records, generics. |
| Collections & Streams | List / Map / Set, the Streams API, Optional, lambdas, date / time. |
| Practical Java | Exceptions, try-with-resources, NIO files, threads, JDBC, Maven / Gradle, JUnit, Spring Boot intro. |
| Examples | Cheatsheet, runnable snippets, quiz, exercises, bootcamp, certificate. |
Who this is for
- Enterprise / backend devs building Spring services, Android apps, or big-data pipelines.
- CS students — Java is the lingua franca of most degree programmes.
- Kotlin / Scala folks who want to read the libraries they consume.
How to use this tutorial: read the chapter, run the example with Try it Yourself », do the exercise, then take the quiz at the bottom. Hit Mark complete when you're done — the sidebar will track your progress.
Example
Example
public class Main {
public static void main(String[] args) {
System.out.println("Hello, Java");
}
}
Try it Yourself »
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