5ce932ceb7
- 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
22 lines
1.1 KiB
Markdown
22 lines
1.1 KiB
Markdown
---
|
|
layout: pattern
|
|
title: Strategy
|
|
folder: strategy
|
|
permalink: /patterns/strategy/
|
|
categories: Behavioral
|
|
tags: Java
|
|
---
|
|
|
|
**Intent:** Define a family of algorithms, encapsulate each one, and make them
|
|
interchangeable. Strategy lets the algorithm vary independently from clients
|
|
that use it.
|
|
|
|
|
|
|
|
**Applicability:** Use the Strategy pattern when
|
|
|
|
* many related classes differ only in their behavior. Strategies provide a way to configure a class either one of many behaviors
|
|
* you need different variants of an algorithm. for example, you might define algorithms reflecting different space/time trade-offs. Strategies can be used when these variants are implemented as a class hierarchy of algorithms
|
|
* an algorithm uses data that clients shouldn't know about. Use the Strategy pattern to avoid exposing complex, algorithm-specific data structures
|
|
* a class defines many behaviors, and these appear as multiple conditional statements in its operations. Instead of many conditionals, move related conditional branches into their own Strategy class
|