Why does Java's standard class library contain empty interfaces like Cloneable and Serializable? Find out why in this sixth installment in the "Object-oriented language basics" series.

Create packages, import packaged classes and interfaces into your programs, move packages, and encapsulate them in jar files.

Collections 101 The Java collections framework is a set of classes and interfaces that implement commonly reusable data collection structures.

How does the open-closed SOLID principle work in a Java program? Here we show you what this important principle means, and how to implement the open-closed principle in Java.

If you want to take advantage of sorting methods in Java, you'll need to implement the Comparable interface.

If you want to master functional programming, the best place to start is with the Java Function interface. This example will show you four different ways to implement this functional interface in your ...