---
layout: pattern
title: Twin
folder: twin
permalink: /patterns/twin/
categories: Structural
language: en
tags:
 - Extensibility
---

## Intent
Twin pattern is a design pattern which provides a standard solution to simulate multiple
inheritance in java

## Class diagram
![alt text](./etc/twin.png "Twin")

## Applicability
Use the Twin idiom when

* To simulate multiple inheritance in a language that does not support this feature.
* To avoid certain problems of multiple inheritance such as name clashes.

## Credits

* [Twin – A Design Pattern for Modeling Multiple Inheritance](http://www.ssw.uni-linz.ac.at/Research/Papers/Moe99/Paper.pdf)
