Here's everything you need to know about initializing Java classes and objects before executing them in the JVM.

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

Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions.

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.

As they exist outside the Java heap, the klasses do not require a Java object header, and they are not the same thing as the class objects used in reflection (which are genuine Java objects).