Introduction to Java

Name: Introduction to Java
Rating: 4.7 (904 reviews)

4.742 hours119K learnersCertificate

Understand the language behind millions of apps. Grasp core concepts, write basic programs, and make your first step toward breaking into tech.

Provided by

JetBrains Academy

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Our students are building their future at:

Study at your own pace

Fit learning around your schedule. Suitable for all levels.

Learn from the experts

Short, practical text lessons by seasoned developers.

Become job-ready

Integrated with professional tools by JetBrains.

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What you'll learn

While completing this course you will work on simple projects which can become a perfect entry point for building your CV and a great practice for passing AP on Computer Science. In this course, you will:

Familiarize yourself with the syntax of the Java programming language;
Recognize fundamental concepts in object-oriented programming (OOP);
Develop a clear understanding of loops and conditional statements in Java;
Apply integer operations for solving basic coding challenges;
Engage in practical exercises involving strings and arrays;
Apply error-handling techniques for Java programs;
Use AI tools to better understand problems, explore solutions, and review code;
Design and develop your initial complex program entirely on your own.

Course program

View all 13 sections

This course includes:

350+: Choice problems
260+: Coding problems
89: Theoretical articles
11: Projects to choose from
: Certificate of completion

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Learn by doing

# 1

Apply knowledge into practice

You already know the theory. Now it's time to code like you do at work—in a professional IDE, with real project constraints, solving problems that actually matter. Welcome to software engineering as it should be.

# 2

Navigate complexity with surgical precision

Most developers waste months learning random concepts without seeing how they connect. Our interactive Knowledge Map fixes this. It shows exactly how every programming concept relates to others, helping you build a structured mental model of coding.

# 3

Copy the best. Then improve.

Here's what top engineers do that others don't: they study other people's code obsessively. When you get stuck on Hyperskill, you can explore solutions published by other developers. See their exact code. Understand their approach. Learn their tricks.

# 4

Code review that actually makes you better

We stripped code review down to what actually matters: does your solution work? Have you handled the edge cases? Is there a cleaner way to write this? Hyperskill acts like a competent reviewer who actually tests your code. Not genius-level analysis, not architecture debates — just solid feedback on making your code better.

Elevate your engineering mastery through real-world challenges

Master advanced engineering concepts through ambitious projects. Each project deepens your expertise and transforms you from an experienced engineer into an exceptional one.

Zookeeper with Java

Learn the very basics of Java coding by building a simple tool for zookeepers. Get to know how to work with variables, strings and arrays, put them in while loops and develop a simple console app from scratch.

Coffee Machine Simulator with Java

What can be better than a cup of coffee during a break? A coffee that you don’t have to make yourself. It’s enough to press a couple of buttons on the machine and you get a cup of energy; but first, we should teach the machine how to do it.
In this project, you'll program a coffee machine simulator using Java. The machine works with typical products: coffee, milk, sugar, and plastic cups; if it runs out of something, it shows a notification. You can get three types of coffee: espresso, cappuccino, and latte. Since nothing’s for free, it also collects the money.
This project allows you to better understand the basic OOP, its main concepts such as classes, class methods and attributes, and get a taste of Java. Practice working with methods, challenge yourself with loops and conditions, and get more confident with OOP.

Graduate

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Learn from the industry experts

JetBrains Academy

JetBrains Academy is a part of JetBrains, a global software company specializing in the creation of intelligent, productivity-enhancing tools for software developers and teams. With years of expertise in software development and education, JetBrains Academy empowers more than a million people worldwide to learn and teach computer science, and help organizations inspire their teams to reach their goals in tech. Professional development tools play a big role in computer science education. This is why JetBrains Academy courses offer integration with JetBrains IDEs. This integration assists learners in getting experience with real development processes to streamline their learning curve at future work.

Your peers think Hyperskill rocks

Martin Pakhomov

6 hours ago

This course helped me improve my understanding of Java fundamentals, object-oriented programming, inheritance, exceptions, arrays, and methods. The practical tasks and projects were useful because they helped me apply the theory in real code and understand how different Java concepts work together.

Alejo Saez Gebicki

1 week ago

El curso tiene buen contenido y combina teoría con práctica, pero considero que el tiempo estimado está bastante por debajo de lo que realmente demanda. Hay mucha teoría para leer y varios ejercicios prácticos son bastante más complejos de lo esperado, especialmente a medida que se avanza. En mi ex ...