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

This post explains how to use classes in Java to build objects and organize your code. Also learn: constructors, static methods, and more!

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.

Use Java's packages and static imports to organize top-level types and simplify access to their static members.

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 ...