For example, you might use a vending machine interface to select an item, pay for it, and receive a food or drink item. From a programming perspective, an interface sits between software components.

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

The functional Predicate interface gets used extensively by the Java 8 Streams API. Any developer who wants to master functional programming in Java will need to be comfortable with the Predicate ...

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.