# Functional Interfaces Can Extend Other Interfaces

DevFeed: [Functional Interfaces Can Extend Other Interfaces](<https://devfeed.tech/articles/a-functional-intreface-can-extend-other-interfaces-30755.md>)

Original publisher: [Read original article](<http://blog.vanillajava.blog/2025/02/a-functional-intreface-can-extend-other.html>)

Author: Peter Lawrey (noreply@blogger.com)

Published: 2025-02-20T09:04:00Z

Content type: article

Language: en

Sources: [Vanilla Java](<https://devfeed.tech/sources/vanilla-java.md>)

Topics: [interfaces](<https://devfeed.tech/topics/interfaces.md>)

Tags: [functional](<https://devfeed.tech/tags/functional.md>), [interface](<https://devfeed.tech/tags/interface.md>), [interfaces](<https://devfeed.tech/tags/interfaces.md>), [puzzles](<https://devfeed.tech/tags/puzzles.md>)

## AI overview

The article explains that a functional interface can extend marker, functional, and non-functional interfaces, as well as an annotation.

## Source excerpt

A functional interface can extend a marker interface, functional interface, non-functional interface, and an annotation. A recent X poll suggested 25% of those responding didn't know that.