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.

Create packages, import packaged classes and interfaces into your programs, move packages, and encapsulate them in jar files.

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.

Why, of course, by virtually starting up the Java class and pushing the buttons, so to speak. You test a Java class by calling methods on it from another Java class. The following Java source file is ...