Java class loaders keep different versions of the same class in separate namespaces, which allows for creating multiple instances of a class with different versions. This is useful for web ...

However, Java refers to class libraries as packages. This article explores packages; I show you how to create packages of classes and interfaces, how to import (that is, bring into a program ...

Java's default constructor allows developers to create instances of classes when no other constructors are explicitly defined. The default constructor in Java takes no arguments -- it simply ...

The release of Java SE 15 in Sept 2020 will introduce ... compilers to reason about exhaustiveness. Sealed classes are also useful for creating secure hierarchies by decoupling accessibility ...

We've looked at the fundamentals of the Java Collections Framework and seen how to create new data structures based on abstract base classes it provides. In the next article, I'll show you how to ...

Instance main methods and unnamed classes, coming in Java 21, will forever change how developers learn Java and bootstrap applications. Why? They provide a simple, clean and concise syntax to launch ...