Java's default constructor lets developers create instances of classes when an explicitly defined constructor does not exist. Here's how it works.

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.

Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

Java 23, now generally available, includes previews of module import declarations, stream gatherers, structured concurrency, scoped values, and a class-file API. And much more.