# Adding Abstraction

How to mark a class and its methods \`abstract\` so it can't be created on its own and every child class must fill in the missing methods.

![Cheat sheet: Adding Abstraction](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/f86e86af6e914363846cc15860011424.webp)

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

Source: https://www.ask-codey.com/cheat-sheets/abstraction-in-oop-adding-abstraction-cheat-sheet