Because Java is open source, there isn't just one JRE, so you can choose the JRE that best suits your needs. To run many Java applications, you must have a Java runtime environment (JRE) installed.
This is by no means universal yet, however. This means there are some applications you can run without even downloading Java.
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Many modern Java applications bundle a small Java module as part of the software itself. Since Java 9, the language has been moving toward a modular design. Projects like IcedTea filled in the gaps for the portions of the Java Development Kit not available under an open license, meaning today, it is possible to run Java applications without using any proprietary code.
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Sun, the original developers of Java, placed much of Java under the GNU General Public License in 2006. The subject of Java licensing is a long and complicated story, but today, most major components of Java are available under open source licenses, and those which are not available under open licenses typically have drop-in replacements which are open. Through the capabilities of Java Enterprise Edition and open source Java application servers like WildFly and Apache Tomcat, Java has a rich ecosystem of tools for powering and connecting massively scalable applications which keep some of the largest websites and business operations out there up and running. While with improvements to JavaScript and HTML, Java applets are no longer the de facto standard for interactive web applications, many still do rely on Java for providing an in-browser interactive experience.īut even though Java isn’t as commonly found as the front-end for web applications these days, it is still a very popular language behind the scenes on many websites and web applications. Java also powers a number of applications built specifically for the web. All sorts of applications, from wildly popular games like Minecraft to the Eclipse integrated development environment used by developers for many different languages and platforms, run on Java. You also might be using Java on your desktop without even knowing it. Android, Linux-derived open source operating system powering millions of mobile devices around the world, uses the Java language along with its own special set of libraries as the basis for mobile applications built for its platform. Java can be found in all sorts of places, perhaps even in your pocket or on your wrist. Other than a part of the name, the two don’t share much in common. While both languages are now found in numerous environments, JavaScript, which is most commonly used to power interactivity inside of a web browser, is a different tool completely.
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Code from other languages which is designed specifically for the JVM, like Groovy and Scala, can also run on the Java virtual machine.īe careful not to confuse Java with JavaScript. While the Java language and the Java virtual machine which runs Java code are closely paired, the two are separate. Unlike some other languages which came before it, which implemented classes but did not require their use, Java programs are always designed with an object-oriented design. The Java programming language itself is an object-oriented language, which is syntactically similar to C++.
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