Skip to content
HackerRank AI Day will unveil new innovations in AI and feature industry thought leaders. Read agenda
The 2024 Developer Skills Report is here! Sneak peak
Programming Languages

What Is Java? Inside the World’s Leading Programming Language

Written By April Bohnert | June 1, 2023

An AI-generated image of the earth over a black and green background

The programming language Java has established itself as a cornerstone of the software development landscape. With its versatility, reliability, and widespread adoption, Java continues to be a powerful force driving innovation in the tech industry, despite being released nearly 30 years ago. In fact, Java ranks No.1 in the list of most-Googled technologies in 80 out of 162 countries worldwide and boasts a market share of over 50 percent in these countries. From web development to mobile app development, enterprise systems to big data processing, and even the Internet of Things (IoT), Java’s capabilities are far-reaching and impactful.

But what exactly is Java? In this blog post, we’ll delve into Java’s origins, key features, advantages, and real-world applications. Whether you’re a hiring manager seeking to better understand the realm of Java or a tech professional looking to broaden your skill set, this comprehensive guide will explain why Java has stood the test of time and how it continues to shape the future of software development.

What is Java?

Renowned as a versatile, object-oriented programming language, Java has left an indelible mark on the software development landscape since its inception. Created by James Gosling and his team at Sun Microsystems (now part of Oracle Corporation) in the mid-1990s, Java was designed to prioritize simplicity, portability, and scalability. These foundational principles have made Java an enduring and widely adopted language across various domains.

At its core, Java values simplicity in both its syntax and design. Its syntax is clean and intuitive, making it easier for developers to read, write, and understand code. Java’s syntax resembles that of the C and C++ programming languages, allowing programmers from those backgrounds to quickly grasp its structure. 

Key Features and Advantages of Java

Java’s enduring popularity can be attributed to its rich set of features and advantages that make it a preferred language for a wide range of projects. Here, we’ll explore some of the key characteristics that set Java apart and contribute to its success.

Platform Independence and Portability

Java’s “write once, run anywhere” (WORA) principle lies at the heart of its design philosophy. By compiling Java source code into platform-independent bytecode, Java programs can be executed on any platform that has a Java Virtual Machine (JVM) installed. This cross-platform compatibility allows developers to write code once and deploy it seamlessly on different operating systems, such as Windows, macOS, and Linux. Java’s portability simplifies the development process, reduces maintenance efforts, and promotes the reuse of code across diverse environments.

Robust Memory Management

Java takes care of memory management through its automatic memory allocation and garbage collection mechanism. Developers don’t need to explicitly allocate and deallocate memory, as Java’s runtime environment handles these tasks. The garbage collector identifies objects that are no longer referenced and frees up memory resources, preventing memory leaks and improving application stability. This built-in memory management system enhances the reliability and predictability of Java applications, freeing developers to focus on writing code rather than managing memory.

Object-Oriented Approach

Java’s strong support for object-oriented programming (OOP) enables developers to build modular, reusable, and maintainable code. The OOP paradigm promotes code organization, abstraction, and extensibility. Its features include:

  • Encapsulation, which hides the internal details of an object, allowing for data protection and providing well-defined interfaces for interaction.
  • Inheritance, which allows classes to inherit properties and behaviors from other classes, facilitating code reuse and promoting a hierarchical structure. P
  • Polymorphism, which enables objects to exhibit multiple forms and behaviors, fostering flexibility, and supporting code extensibility.

Java’s embrace of OOP principles makes it an ideal choice for building complex and scalable applications.

Exception Handling

Java incorporates a robust exception-handling mechanism, allowing developers to handle errors and exceptional conditions effectively. Exceptions provide a structured approach to deal with unexpected situations that can occur during program execution. By using try-catch blocks, developers can handle exceptions gracefully, preventing application crashes and ensuring a more robust user experience. Java’s exception handling promotes the creation of reliable and fault-tolerant applications by facilitating error detection, reporting, and recovery.

Rich Standard Library and Ecosystem

Java offers a comprehensive standard library that provides a wide range of classes and APIs for common programming tasks. The Java Development Kit (JDK) includes libraries for I/O operations, networking, collections, concurrency, and more. These built-in tools save development time and effort by offering ready-to-use solutions for common programming challenges. Additionally, Java benefits from a thriving ecosystem of third-party libraries, frameworks, and tools. Popular frameworks like Spring, Hibernate, and Apache Struts provide higher-level abstractions, simplifying the development of web applications, enterprise systems, and more. The vast ecosystem of Java libraries empowers developers with a wealth of resources to enhance productivity, leverage specialized functionalities, and accelerate application development.

Multithreading and Concurrency

Java’s robust support for multithreading and concurrency allows developers to create efficient and responsive applications that can perform multiple tasks simultaneously. The Java concurrency model enables the execution of multiple threads within a single program, allowing for parallel processing and efficient utilization of system resources. Java provides built-in thread management mechanisms, synchronization constructs, and thread-safe data structures, making it easier to develop concurrent applications. With Java’s multithreading capabilities, developers can take advantage of modern hardware architectures and build high-performance applications that scale well with increasing demands.

Practical Use Cases of Java

Java’s versatility and robust feature set make it a versatile programming language that can be applied to a wide range of domains and use cases. Here are some practical applications where Java shines and continues to drive innovation.

Enterprise Software Development

Java has long been the language of choice for developing enterprise-level software systems. Its scalability, reliability, and extensive ecosystem of frameworks and libraries make it ideal for building large-scale, mission-critical applications. Java Enterprise Edition (Java EE), now known as Jakarta EE, provides a set of specifications and APIs for developing enterprise software, including features such as servlets, JavaServer Pages (JSP), Enterprise JavaBeans (EJB), and Java Persistence API (JPA). With Java EE, developers can create robust and scalable web applications, middleware, and back-end systems that can handle high traffic and complex business logic.

Web Development

Java’s web development capabilities are well-established, thanks to frameworks like Spring, JavaServer Faces (JSF), and Apache Struts. These frameworks provide developers with powerful tools for building web applications, handling requests, managing session state, and interacting with databases. Java-based web development is known for its stability, security, and support for industry standards. Whether it’s developing e-commerce platforms, content management systems, or enterprise web applications, Java’s web development frameworks offer a solid foundation for building robust and scalable solutions.

Android App Development

Java is the primary programming language for developing Android applications. Android Studio, the official integrated development environment (IDE) for Android, uses Java as its main language for building mobile apps. Java’s object-oriented nature, along with the Android SDK and libraries, provides developers with a powerful toolkit for creating feature-rich and interactive mobile applications. Java’s wide adoption in the Android ecosystem makes it a valuable skill for developers targeting the mobile app market.

Big Data and Analytics

Java plays a significant role in the big data and analytics landscape. Hadoop, a popular open-source framework for processing and analyzing large data sets, is built using Java. Java’s scalability, parallel processing capabilities, and compatibility with distributed computing systems make it an excellent choice for handling big data workloads. Additionally, Java libraries like Apache Spark and Apache Flink provide high-level abstractions and APIs for distributed data processing and real-time analytics. Java’s presence in the big data ecosystem enables developers to harness the power of data and derive valuable insights from massive datasets.

Financial and Trading Systems

Java has a strong foothold in the financial industry, where reliability, performance, and security are paramount. Many banking systems, trading platforms, and financial applications are built using Java. The language’s robustness, extensive libraries for data manipulation and encryption, and support for distributed computing make it an excellent choice for handling complex financial calculations, risk analysis, and algorithmic trading. Java’s ability to handle high transaction volumes and its mature ecosystem of financial libraries and frameworks position it as a top choice for building mission-critical financial systems.

Internet of Things (IoT) Development

With the rise of the Internet of Things (IoT), Java has emerged as a popular choice for developing IoT applications. Java’s ability to run on embedded systems and its support for network communication make it well-suited for IoT development. The lightweight Java Micro Edition (Java ME) platform provides a subset of Java technologies optimized for resource-constrained devices, making it ideal for IoT devices with limited processing power and memory. Java ME enables developers to create IoT applications that connect and interact with sensors, actuators, and other IoT devices, facilitating data collection, analysis, and control. Furthermore, Java’s extensive ecosystem of libraries, frameworks, and tools simplifies IoT application development, accelerating the time-to-market for IoT solutions.

Java’s Impact in the Job Market

Java is not only a powerful programming language but also a highly sought-after skill in the job market. In our 2023 Developer Skills Report, Java was the most in-demand programming language, based on volume of monthly active tests. Its versatility and wide range of applications have contributed to its significant impact in various industries and job roles and led to a continuous demand for professionals with Java expertise. 

To learn more about the skills and competencies needed for a range of Java positions, check out our roles directory.

This article was written with the help of AI. Can you tell which parts?

Abstract, futuristic image generated by AI

What Is Spring Boot? Redefining Efficiency in Java Development