The Java Runtime Environment spawns a JVM, which is a software layer that runs on top of a computer’s operating system, providing additional services specific to Java.

Is Java installed? To run the Java command, first you must have Java installed. This means either the Java Runtime Environment (JRE) or the full Java Development Kit (JDK).

Here's a quick look at the three types of class loaders and everything you need to know to work with them in your Java programs.

Javaw.exe is an executable component integrated within the Oracle Java Runtime Environment (JRE). It is essential to run certain Java-based programs including JAR files without using a console window.

Java is still being used. We tell you how to install Java and make sure that you have enabled the latest Java version on your Windows computer.

Mac OS Runtime for Java (MRJ) provides Mac users with the ability to run applets and full applications written in Java.