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.

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

Here's how to make classes, fields, methods, constructors, and objects work together in your Java programs.

Since I have done most of my coding for classes (and almost exclusively in Java), I have always just run my programs through the compiler and never had to worry about actually setting it up to run ...