Java is a popular programming language that every programmer should learn. This article explains much of what you need to know.

The Java virtual machine (JVM) is a program whose sole purpose is to execute other programs. This simple idea has made Java one of the most successful and long-lived platforms of all time.

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.

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.