java-design-patterns/twin/README.md

---
layout: pattern
title: Twin
folder: twin
permalink: /patterns/twin/
pumlid: 7SR13OCm30NGLUW0n7UsCS42eyH4zdUpFbNVwNtKQij3qjjo0ICs8kTPJiMLUuPuVGnYAFNff2qdWvrk_l9wIEXfws10t88wno-4gKQ2-az9xsLaRoy0
categories: Creational
tags:
 - Java
 - Difficulty-Intermediate
---

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

![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)
-												implements Twin design pattern #63

											
										
										
											2015-11-14 17:38:35 +08:00
+								---
 								layout: pattern
 								title: Twin
 								folder: twin
 								permalink: /patterns/twin/
-												Work on #190: Commit initial pumlId's added by the script

											
										
										
											2016-08-30 15:10:34 +02:00
+								pumlid: 7SR13OCm30NGLUW0n7UsCS42eyH4zdUpFbNVwNtKQij3qjjo0ICs8kTPJiMLUuPuVGnYAFNff2qdWvrk_l9wIEXfws10t88wno-4gKQ2-az9xsLaRoy0
-												implements Twin design pattern #63

											
										
										
											2015-11-14 17:38:35 +08:00
+								categories: Creational
-												Categorize and tag all patterns #213

											
										
										
											2015-12-28 15:52:44 +02:00
+								tags:
 								 - Java
 								 - Difficulty-Intermediate
-												implements Twin design pattern #63

											
										
										
											2015-11-14 17:38:35 +08:00
+								---
-												Use headings instead of bold text in index.md #238

											
										
										
											2016-01-03 21:14:30 +01:00
+								## Intent
 								 Twin pattern is a design pattern which provides a standard solution to simulate multiple
-												implements Twin design pattern #63

											
										
										
											2015-11-14 17:38:35 +08:00
+								inheritance in java
 								![alt text](./etc/twin.png "Twin")
-												Use headings instead of bold text in index.md #238

											
										
										
											2016-01-03 21:14:30 +01:00
+								## Applicability
 								Use the Twin idiom when
-												implements Twin design pattern #63

											
										
										
											2015-11-14 17:38:35 +08:00
 								* to simulate multiple inheritance in a language that does not support this feature.
-												implements Twin design pattern #63, add credit and rephrase the comments

											
										
										
											2015-11-16 10:01:03 +08:00
+								* to avoid certain problems of multiple inheritance such as name clashes.
-												Use headings instead of bold text in index.md #238

											
										
										
											2016-01-03 21:14:30 +01:00
+								## Credits
-												implements Twin design pattern #63, add credit and rephrase the comments

											
										
										
											2015-11-16 10:01:03 +08:00
-												Categorize and tag all patterns #213

											
										
										
											2015-12-28 15:52:44 +02:00
+								* [Twin – A Design Pattern for Modeling Multiple Inheritance](http://www.ssw.uni-linz.ac.at/Research/Papers/Moe99/Paper.pdf)