java-design-patterns/delegation/README.md

---
layout: pattern
title: Delegation
folder: delegation
permalink: /patterns/delegation/
categories: Structural
language: en
tags:
 - Decoupling
---

## Also known as
Proxy Pattern

## Intent
It is a technique where an object expresses certain behavior to the outside but in 
reality delegates responsibility for implementing that behaviour to an associated object. 

## Class diagram
![alt text](./etc/delegation.png "Delegate")

## Applicability
Use the Delegate pattern in order to achieve the following

* Reduce the coupling of methods to their class
* Components that behave identically, but realize that this situation can change in the future.

## Credits

* [Delegate Pattern: Wikipedia ](https://en.wikipedia.org/wiki/Delegation_pattern)
* [Proxy Pattern: Wikipedia ](https://en.wikipedia.org/wiki/Proxy_pattern)
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00			`---`
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`layout: pattern`
			`title: Delegation`
			`folder: delegation`
			`permalink: /patterns/delegation/`
https://github.com/iluwatar/java-design-patterns-web/issues/8 Update pattern categories and tags 2019-12-13 21:09:28 +02:00			`categories: Structural`
fix: Fixed pages showing up in wrong language (#1752) * Fix languages * Missed change for version number * Add language field for presentation * Revert change in README for double buffer Co-authored-by: Jackie Nim <=> 2021-05-19 10:49:05 -06:00			`language: en`
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`tags:`
https://github.com/iluwatar/java-design-patterns-web/issues/8 Update pattern categories and tags 2019-12-13 21:09:28 +02:00			`- Decoupling`
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`---`

Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Also known as`
			`Proxy Pattern`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Intent`
			`It is a technique where an object expresses certain behavior to the outside but in`
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`reality delegates responsibility for implementing that behaviour to an associated object.`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
#1113 Link uml-reverse-mapper created class diagrams to readme, where needed 2019-12-07 20:01:13 +02:00			`## Class diagram`
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`![alt text](./etc/delegation.png "Delegate")`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Applicability`
			`Use the Delegate pattern in order to achieve the following`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
Populate the index.md for the delegate module #324 2015-12-28 18:16:58 +00:00			`* Reduce the coupling of methods to their class`
			`* Components that behave identically, but realize that this situation can change in the future.`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Credits`
Add template index.md for population later #324 2015-12-26 22:29:45 +00:00
Update index.md #324 2015-12-30 18:26:32 +00:00			`* [Delegate Pattern: Wikipedia ](https://en.wikipedia.org/wiki/Delegation_pattern)`
Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`* [Proxy Pattern: Wikipedia ](https://en.wikipedia.org/wiki/Proxy_pattern)`