This tutorial introduces the difference between classes and interfaces, then guides you through examples demonstrating how to declare, implement, and extend Java interfaces.

Don't be intimidated by the prospect of doing functional programming in Java. This step-by-step example will help you learn basic Java lambda syntax quickly and effectively.

For example, InetAddress (in the java.net package), which represents an Internet Protocol address, declares a private Addresses interface that’s implemented by private CachedAddresses and ...