from Java’s perspective, an interface is the introduction (but not an implementation) of a type at the source code level. To understand that concept, you first must grasp the notion of type ...

You’ll learn how to use each of these elements in your Java annotations. Using @interface to declare annotation types You can declare an annotation type by specifying the @ symbol immediately ...

unary types and suppliers, knowledge of the rest of the API simply falls into place. In this functional programming tutorial, we will work through a Java Supplier interface example. Java’s functional ...

This is where Java’s functional Consumer interface comes in handy. According to the JavaDoc, the Consumer interface accepts any type of object as input. The java.util.function.Consumer class has one ...