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

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.

Describe the bug I tried customized QuarkusMain method as shown in https://quarkus.io/guides/lifecycle#the-main-method with Java 21 Instance Main Methods (preview feature).

HelloWorld application in Java To write a modern, standalone Java application that uses Java 21’s unnamed classes and instance main method features, the full code is as follows: void main() { ...

Say goodbye to the public static void main method in Java 21 with the unnamed classes and instance main methods preview features.

Describe the bug When using an interface which inherits from other interfaces which have @Composable default methods, the application immediately crashes at runtime with the following exception: ...

There are several different uses of Static methods for example, using it, you can change a static data member and its value. However, there are still some limitations when using a Static method. For ...