# Defining Interfaces

How to write a Java interface and implement more than one in a class with the \`implements\` keyword.

![Cheat sheet: Defining Interfaces](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/23d32ec2448348fba28bb53cd2d9bdc6.webp)

- Category: Java
- Level: Journeyman
- Tags: java, OOP
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/defining-interfaces-cheat-sheet