Level 1 recap: why learn Java and what you already know how to do

1. 🚀 Java — one of the most popular programming languages

Did you know that Java is one of the most popular and in-demand programming languages in the world?

According to the TIOBE index, roughly one in eight developers worldwide writes in Java. And in other reputable rankings (Stack Overflow, RedMonk) Java consistently ranks in the top 3 for popularity. The language has been evolving actively since the mid-1990s, and it is used by both large corporations and young startups 👨‍💻

Java appeared in 1995 and quickly gained popularity thanks to its cross-platform nature, stability, and rich ecosystem. Developers migrated to it from other, more cumbersome and complex languages. Today, Java is a universal tool suitable for solving tasks in a wide range of domains, from banking systems to mobile applications.

So what makes Java so attractive to developers? 🤔

Java has absorbed the best ideas of object-oriented languages while avoiding many of the complexities that hinder code maintenance. Where in other languages the same result can be achieved in dozens of ways, in Java there are usually one or two proven, understandable, and readable approaches. This is especially important for large teams, where readability and maintainability of code are key.

In large projects, developers spend up to 90% of their time reading and analyzing code and only 10% writing new code. Java’s simplicity, predictability, and structure provide a major advantage for teamwork and make the language comfortable even for beginners.

2. 🥇 Major areas where Java is used

Thanks to its advantages, programs built with Java and JVM technologies can run almost anywhere: on Windows, Linux, macOS, in the cloud, on mobile devices, in the browser, and even on IoT devices. Here is where Java is especially in demand:

• 🎮 Games
  Although Java is more often associated with business applications, legendary projects have been built with it, including Minecraft. In addition, there are JVM-based game engines, such as LibGDX, that let you write cross-platform 2D/3D games. If you dream of creating your own game project, Java is an excellent starting point.
• 🌍 Web development
  Using Java and frameworks like Spring Boot, Micronaut, and Quarkus, developers build fast, reliable, and scalable web applications. Corporate portals, online banking, booking systems, and services with millions of users run on Java. Java is known for its stability under high load and reliable transaction processing.
• 🏦 Business and enterprise applications
  Java is the No. 1 choice for the financial sector and large corporations. It is used in banks, insurance companies, stock exchanges, logistics, and telecom. It is the language used to build ERP systems, CRM, document management, and accounting systems. Large enterprises and investment banks choose Java, and as a result, salaries there are among the highest in the industry.
• 📱 Mobile applications
  Java is a primary language for Android development. Thousands of popular apps on Google Play are written in Java (or Kotlin, which is fully interoperable with Java). This allows a single team to build solutions for millions of smartphone users.
• 💻 Desktop applications
  With Java you can build cross-platform programs that will work the same on Windows, macOS, and Linux. Technologies like JavaFX, Swing, and SWT make it possible to develop both lightweight utilities and complex enterprise systems with a convenient graphical user interface.
• ☁️ Cloud services and IoT
  Java is widely used on cloud platforms (AWS, Google Cloud, Azure) and in Internet of Things projects. It is well suited for working with data streams, controlling sensors, real-time analytics, and automating business processes.

Java is not just a language but an entire ecosystem: hundreds of thousands of libraries and frameworks, a huge community, extensive documentation, and quick answers to questions. The more you work with Java, the clearer it becomes why this language has held the lead for almost three decades.

3. 🎯 Level 1 recap

Congratulations — you’ve completed your first level on CodeGym! It was just one level, yet you’ve already mastered many important and interesting things. Great job! 👍

You learned:

• What variables are;
• How to print messages to the screen;
• You learned about the int and String types;
• How compilation in Java differs from other languages;
• How to write comments in Java and why they’re needed.

Excellent! Of course, the next levels won’t be as easy, but their difficulty will increase gradually. The same goes for the complexity of the practical tasks. It’s like at the gym: we slowly increase the load, and in six months a beginner is bench‑pressing a 100‑kilogram barbell 💪

Boring lessons stayed in the 20th century. Imagine this — writing with chalk on a blackboard. Nothing has changed since the 15th century. They probably still had dinosaurs walking down the streets back then 🦕

You’re moving on to the next level! 🚀