Java interfaces are different from classes, ... Jeff Friesen teaches Java technology (including Android) to everyone via articles, blogs, books, and software.

How to use Java’s Function interface. For this Java Function interface example, we will provide a single method named “apply” that takes an Integer as an argument, squares it and returns the result as ...

More about Java interfaces. For an introduction to Java interfaces, ... Jeff Friesen teaches Java technology (including Android) to everyone via articles, blogs, books, and software.