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What is Java Runtime used for?

Updated: 8/11/2023
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10y ago

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A Java Runtime Environment (JRE) is the base set of data files and programs (executables) which are required to run Java Applications. Typically, this consists of a Java Virtual Machine (a virtual computer/processor which the Java program runs 'on'), the Java Libraries (definitions of objects and functionality which Java programs can utilise), and any additional supporting software.

If you have been instructed to get java so that you may use a certain website or piece of software, this means you are required to install a JRE.

The 'standard' JRE is developed by Sun Microsystems, the original developers of Java, and is available at http://java.sun.com/

Typically, each JRE version has had multiple updates since its initial release, so you will probably need to download a file called something like Java 6 update 2, or JRE 6 update 2, or even referred to via shorthand like Java 6u2.

To test which version of a JRE is installed (if any), run the command "java -version" in a command-line (Windows) or Terminal (Unix/Linux/Mac).

Other run-time implementations of Java are available under different license conditions, although most focus on the actual JVM itself, rather than completely re-implementing all of the additional tools and libraries.

The JRE is distinct from the JDK (Java Development Kit) in that the JDK contains additional software which is required only for developing Java applications - such as the Java Compiler javac, and which most users will not require.

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The Java Runtime Environment (JRE) provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language. In addition, two key deployment technologies are part of the JRE: Java Plug-in, which enables applets to run in popular browsers; and Java Web Start, which deploys standalone applications over a network.

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The Java Runtime Environment (JRE) is commonly referred to as Java Runtime. It is software that allows computers to run Java applications and is part of the Java Development Kit (JDK).

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