In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

The release of Java SE 15 in Sept 2020 will introduce "sealed classes" (JEP 360) as a preview feature. A sealed class is a class or interface which restricts which other classes or interfaces may ...

It is reproduced from the book Developing Scalable Series 40 Applications: A Guide for Java Developers, by Michael Juntao Yuan and Kevin Sharp. Topics Spotlight: New Thinking about Cloud Computing ...

In other words, a Java class that supports the SOLID open-closed principle will find use in originally un-envisioned scenarios, and be flexible enough to work with newly created classes, interfaces ...