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.

See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

In this Java tutorial for beginners, ... This not only serves as an interface for your Java (or Kotlin) ... you now have a good idea of how to learn Java. You can even write some simple code ...

There are only a few key intefaces you need to master in order to become a competent functional programmer. If you understand the concepts laid out in this functional Consumer interface example, ...

The UnaryOperator function. Like the Function interface, the UnaryOperator is passed a value and returns a value. However, the distinction between the UnaryOperator and the Function is that the ...