Java explained: A no-nonsense guide

By IBM Cloud Education

  • Adapt desktop applications to portable devices easily with Java™
  • Shorten development cycles and extend the longevity of enterprise applications
  • Standardize on one development technology across a broad range of use cases
  • Build applications for emerging technologies such as the Internet of Things, machine learning and big data

New and improved software development tools are coming to market at a remarkable pace, displacing incumbent products once thought to be indispensable. In light of this continual turnover, Java’s longevity is impressive: More than two decades after its creation, Java is still the most popular language for application software development — developers continue to choose it over languages such as Python, Ruby, PHP, Swift, C++ and others. As a result, Java remains an important requirement for competing in the job market.

Before exploring the reasons for Java’s enduring popularity, let’s review the structure of Java and its importance for enterprise application development.  

Interested in learning more with a hands-on approach? IBM offers a simple tutorial for building a scalable web application using Kubernetes and the Java platform.

 

What is Java?

Java is a technology consisting of both a programming language and a software platform. To create an application using Java, you first write the program in the Java programming language, then compile the program into Java bytecode — the instruction set for the Java Virtual Machine (JVM) to use at runtime. Java bytecode runs without modification on any system that supports JVMs — it’s the origin of the “write once, run many” (WORM) expression used by Java aficionados.

The Java software platform consists of the JVM, the Java API and a complete development environment. The JVM parses and runs (interprets) the Java bytecode. The Java API consists of an extensive set of libraries including basic objects, networking and security functions; XML generation; and web services. Taken together, the Java language and the Java software platform form a powerful, proven technology for enterprise software development.

But is it right for your needs?

 

Why does Java matter?

If you are an enterprise application developer, it’s likely that your organization already has thousands, even millions of lines of production code written in Java. You will likely need some level of Java expertise to allow you to troubleshoot, maintain and upgrade your existing code base.

However, it would be a mistake to view Java only in terms of legacy applications. The Java language forms the heart of the Android operating system, which powers by far the largest share of the world’s smartphones. Java is also among the most popular languages for machine learning and data science applications. Its robustness, ease of use, cross-platform capabilities and security make Java the language of choice for internet solutions in many enterprise shops.

In particular, Java technology is an ideal framework for developing web applications, the foundation for a digital business in any industry. Java application servers are web containers for Java components, XML and web services, which interact with databases and provide dynamic web content. Java application servers form a stable deployment environment for enterprise applications with capabilities such as transaction management, security, clustering, performance, availability, connectivity and scalability.

 

The technical case for Java

When it comes to choosing a programming language and environment for your next enterprise application, there are solid technical reasons to consider Java, including interoperability, scalability and adaptability.

The core philosophy behind its creation — interoperability across disparate devices — remains the strongest argument for favoring Java for new enterprise applications. Java’s object-oriented architecture allows you to create modular programs and reusable code, shortening development cycles and extending the longevity of enterprise applications.

Platform scalability is a key attribute of Java. With Java, you can standardize on one technology across a broad range of use cases. Existing desktop applications can be easily adapted to run on smaller devices that have limited resources. You can also migrate applications from mobile to desktop, developing business apps for the Android platform and then integrating them into your current desktop software, bypassing lengthy and expensive development cycles.

Java also wins points with strategic planners for its ability to adapt to new use cases. For example, Java is widely considered to be an ideal platform for the Internet of Things (IoT). The typical IoT application interconnects a large number of disparate devices, a task that is greatly simplified by the fact that billions of devices run Java. Furthermore, Java’s extensive ecosystem of developers is constantly developing and sharing new libraries with functionality specifically targeted at IoT application development.

 

Architecture for a Java-based web application on Kubernetes cluster

An architecture for developing and deploying a Java-based web application on a Kubernetes cluster

 

The business case for Java

The technical arguments for Java are compelling, but the business reasons to choose Java are equally strong: a large talent pool, a short learning curve and a wide range of integrated development environments (IDEs).

As more companies use connected devices, machine learning algorithms and cloud solutions, the demand for skilled developers continues to grow. Many analysts foresee a scarcity of senior-level programmers in the near future, making it difficult to staff new software initiatives. Demand for mobile app developers could soon easily exceed the available supply.

The large talent pool of Java developers constitutes a compelling reason to base major software initiatives on Java. When staffing managers post job openings for Java developers, they can expect to receive many qualified resumes and fill those positions relatively quickly. Managers can also draw on contract resources to supplement in-house staff for specific tasks without adding headcount.

In addition to senior-level developers, major software initiatives also require large numbers of junior contributors. While Java remains a popular introductory programming language in university computer science curriculums, many graduates lack the proficiency to be productive at day one. Java is easier to learn and master than many other programming languages, leading to a shorter learning curve and faster ramp-up to productivity. Java’s extensive online community of developer forums, tutorials and user groups helps beginners get up to speed rapidly and provides seasoned programmers with effective, proven problem-solving tools.

In the area of programming tools, Java offers a range of IDEs. Experienced Java developers can quickly ramp up on a new environment, which frees development managers to choose the IDE that best fits the type of project, budget, development methodology and programmer skill level. Many seasoned Java programmers think of NetBeans, Eclipse and IntelliJ IDEA as the top three IDEs for enterprise application development. But there are cases where a more lightweight IDE such as DrJava, BlueJ, JCreator or Eclipse Che is the best choice.

 

Moving forward

Java is a staple in the world of enterprise application development. The vast majority of Fortune 500 companies depend on Java for production applications. Many of these applications are migrating to mobile platforms, a process made much easier because of Java’s portability and scalability.

Despite the ever-widening choice of software technologies, Java remains popular with software managers due to its ease of learning and ubiquity. Seasoned developers take advantage of extensive Java online resources and communities to streamline application development and simplify troubleshooting, reducing time to market and increasing quality. For both business and technical reasons, Java will continue to be an essential technology in software groups developing enterprise applications.

Interested in learning more with a hands-on approach? IBM offers a simple tutorial for building a scalable web application using Kubernetes and the Java platform.