If you own an Apple device, you can't run Java—at least not as Java, although there is a project to port Java code to Objective C but that's another story. If you own a Windows-based or Android ...

The Java Virtual Machine ensures that your Java applications have access to the minimum resources they need to run. It is thanks to the JVM that Java code is so easily run across platforms.

The JDK is the development platform for building Java applications. Learn about different JDK versions, then install a JDK in your development environment and use it to compile a Java program.