Markus 5ce932ceb7 Work on #213
- properly categorize all patterns
- remove pattern list from readme
- minor fixes to readme
- removed "introduction" because its not a pattern and an error i
committed some time ago
2015-08-20 21:40:07 +02:00

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Markdown

---
layout: pattern
title: Double Dispatch
folder: double-dispatch
permalink: /patterns/double-dispatch/
categories: Other
tags: Java
---
**Intent:** Double Dispatch pattern is a way to create maintainable dynamic
behavior based on receiver and parameter types.
![alt text](./etc/double-dispatch.png "Double Dispatch")
**Applicability:** Use the Double Dispatch pattern when
* the dynamic behavior is not defined only based on receiving object's type but also on the receiving method's parameter type.
**Real world examples:**
* [ObjectOutputStream](https://docs.oracle.com/javase/8/docs/api/java/io/ObjectOutputStream.html)