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What is Java? What is it used for?

What is Java? What is it used for?

In this blog, you'll gain a comprehensive understanding of the Java programming language, including its uses, advantages, differences from other languages, and ways to learn Java.
9 Minutes

Java is one of the most popular programming languages used by millions of developers. It is known for its efficient processing speed in computer games, desktop applications, and mobile-based software. It is used for developing web-based applications and software for multiple platforms. Developed by Sun Microsystems in 1995, Java is an object-oriented, class-based, and concurrent programming language. It is based on the syntax of C++ and C. Considered a high-level language, Java is easy to read, making it a language that beginners in coding can also learn. Do you know what can be done with Java and what are the advantages of using this language?

What is Java?

Java is a programming language designed to work in harmony with a wide variety of operating systems. Because it's both compiled and interpreted, it's one of the dual-stage software languages. In this language, code is first compiled, then converted into a binary format known as Java Byte Code. Finally, it is compiled and interpreted into the native language required to run in the target operating environment. Although it may seem complex, this behavior offers advantages for developers because they can write code once and run it anywhere.

Since 1995, Java's portability has become the most sought-after concept among developers. This characteristic gave rise to the slogan "Write Once, Run Anywhere" (WORA), which has become a philosophy among developers. As one of the oldest programming languages, Java is still used today to write complex technologies, from mobile applications to artificial intelligence programming. The features of Java can be summarized as follows:

  • It helps users achieve error-free programming. One process that supports this goal is Runtime Checking (RTC). RTC automatically detects runtime errors and alerts users.
  • Java programs and applications leverage a multi-threaded structure. Multi-threading allows programs to run separately and concurrently, reducing the load on the CPU.
  • It uses a distributed language system that enables secure code portability and access across different machines.

What is Java used for?

Java is used for software development in many areas, including websites, mobile applications, GUIs, game development, embedded systems, and desktop applications. It is not only used in computers and mobile devices but also in electronic devices like televisions, air conditioners, and washing machines. Online registration forms, banking applications, and internet shopping are all made possible thanks to Java. Today, the most common uses of Java can be summarized as follows:

  • Mobile Application Development: Since the launch of smartphones, mobile application development has gained importance. Today, the most popular smartphone app store has millions of applications. By nature, the Java programming language is a perfect choice for creating complex applications with multiple interfaces.
  • Blockchain Mobile Development: Blockchain technology gained popularity with the emergence of cryptocurrencies, but it is not used solely for crypto. One significant use is to track timestamps in scientific papers, where cryptography ensures the accuracy of timestamps and related information. With the increasing popularity of blockchain technology, it is now found everywhere, including on mobile phones. The WORA philosophy also allows Java to be actively involved in blockchain technology, similar to mobile development.
  • Artificial Intelligence: Artificial intelligence is a type of software designed to perform complex automated calculations. AI software is used in many areas, including credit and banking services. Java is also utilized to code these software applications.
  • Big Data: Big data is a sector that involves tracking and reporting data for various needs. Many companies use data analytics to track users, products, sales, and more. Java makes it easier to create visualizations that represent and analyze this data. This usability helps simplify the process of working with large amounts of data.
  • Internet of Things (IoT): The Internet of Things defines the connection of physical devices that need to communicate and share data. As a programming language, Java is one of the best choices for connecting devices.
  • Software Development: Java is a great choice for software development because it is flexible enough to run in various operating environments according to the WORA philosophy. Developers can write the code once and run it anywhere, allowing for software creation across multiple systems simultaneously. Due to its compiled and interpreted nature, any software written in Java can quickly run on any device with a Java Virtual Machine. This capability is a key reason why Java remains popular in many industries.
  • Web Development: In the web development industry, the Java programming language is used in many areas, especially in database management. Developers use this programming language to create interaction on web pages. Thanks to its flexibility, Java contributes significantly to improving the user experience.

How does Java work?

Java works by compiling source code into bytecode. This bytecode can then be compiled into machine code with the Java Virtual Machine (JVM). Java's bytecode can run on any device with a JVM. This means that once each operating system has its own JVM, it becomes a platform-independent environment that converts Java into machine code understandable by the computer. Thanks to this JVM architecture, Java has the "write once, run anywhere" feature.

Individual computers typically use different machine languages. So, if you compile a Java program into a single machine language, the compiled program won't work on multiple machines. This is where JVM steps in, as it acts as a simulated machine for multiple applications on each computer. Once Java code is compiled into JVM bytecode, the code runs according to the JVM. The JVM then communicates the actual processing tasks to the processor in its native language. The JVM is a part of the Java Runtime Environment (JRE).

How to learn Java?

Java is learned by understanding its principles and fundamentals, then practicing extensively. Exploring basic information online can help you start your journey into Java programming. If you're entirely new, the code may seem meaningless. Thus, you should first learn the principles and objectives of Java. Then you can follow these steps:

  • Practice Coding: After understanding the basics, the best thing to do is develop your skills through regular practice. You only truly grasp the knowledge when you apply what you've learned. This means you should code much more than you read or research. Download the Java version appropriate for your operating system, complete the installation, and start coding practice right away.
  • Follow Your Code on Paper: You can write down the variables in your code on paper and mentally go through each potential step to understand the correct solution. Then you can transfer these steps to your code on your computer.
  • Read Java Programming Resources Regularly: You can improve by reading about Java programming. Software requires constant updating. For this reason, even when you become an expert, you'll continue reading.

You can join online courses to learn Java and improve your programming skills. This way, you can quickly grasp the fundamentals of this language and move to the coding practice stage efficiently.

What are the advantages of using Java?

The most significant advantage of using Java is that you can write code once and run it anywhere. Other advantages include:

  • Easy to Understand and Read: It is one of the simpler and easier-to-understand languages. Additionally, Java eliminates all the complex features of C and C++, such as pointers, structures, and unions. This makes code implementation easier.
  • Object-Oriented: One of its greatest advantages is that it's an object-oriented programming (OOP) language. Procedural programming involves implementing procedures that perform operations on data. OOP, on the other hand, works by creating objects that contain both data and methods. This way, larger codebases are broken down into smaller, named pieces.
  • Secure: Languages like C and C++ use pointers that allow access to memory locations. Pointers can lead to unauthorized memory access, posing a security risk. Java includes encapsulation, abstraction, and other OOP concepts that enhance security and prevent unauthorized access.

What can be done with the Java language?

One of the most popular and enduring programming languages, Java has been a cornerstone of the digital world for decades. Java's usage can be summarized as follows:

  • Desktop Applications: One of Java's most popular uses is developing client-side desktop applications that require end users to install the Java Runtime Environment (JRE).
  • Enterprise Applications: Java is the primary programming language for enterprise application development. Enterprise applications are tools used by organizations to carry out their daily operations.
  • Embedded Systems and Microcontrollers: Java is used for embedded systems, which are specialized computer systems designed to perform one or a few limited tasks with minimal size, power consumption, and cost.
  • Desktop GUIs: User interface (UI) designers work with Java to develop desktop graphical user interfaces (GUIs).
  • Real-Time Systems: Real-time systems, which require timely responses to events, can be created with Java. Manufacturing, aerospace, military, and logistics applications benefit from Java's capabilities.

Many brands in social media, technology, and other industries use Java as their programming language. The following list shows some of these brands and what they do with Java.

  • Airbnb: Back-end and server development for the website and Android application
  • Uber: Developing and maintaining software that processes passenger data
  • Spotify: Back-end development
  • Meta: Back-end programming for social media platforms like Facebook and Instagram
  • Slack: Back-end development
  • eBay: Running the back-end side of the website
  • Google: Development of Google Web Toolkit, Android applications, and Gmail

If you also want to improve your Java skills, you can join online courses. You can view bootcamp events organized for free on Through these events, you can acquire theoretical knowledge and have the opportunity to try out everything you've learned in practice.

Why is Java a platform-independent language?

Java is a platform-independent language because it uses a virtual machine. The compiler compiles the code into bytecode, which can be run on multiple systems, making it not tied to any specific hardware.

What is the difference between Java and JavaScript?

Java is used to create applications that run on a virtual machine or in a browser, while JavaScript code only runs in a browser. JavaScript code is entirely text-based, whereas Java code must be compiled. In brief, JavaScript is more commonly used for web applications in browsers, while Java is used for application development and back-end applications.

What are the requirements for bootcamp participation?

Although the requirements vary for each event, to apply for a bootcamp, you only need to be interested in software development. These events allow you to acquire up-to-date knowledge and experience new projects.

How can I join the Discord channel?

You can join the Discord channel by clicking the following link: You can find the latest news and event announcements on the Discord channel.

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