tiennm99/java-design-patterns
1
0 Fork 0
mirror of https://github.com/tiennm99/java-design-patterns.git synced 2026-10-13 00:14:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

Use headings instead of bold text in index.md #238

Browse Source
This commit is contained in:
Jeroen Meulemeester committed 2016-01-03 21:14:30 +01:00
1 parent b6beffec2e
commit 3d642cdad7
66 files changed
+373 -233
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

state/index.md
+7 -4
View File
@@ -10,18 +10,21 @@ tags:
- Gang Of Four
---
**Also known as:** Objects for States
## Also known as
Objects for States
**Intent:** Allow an object to alter its behavior when its internal state
## Intent
Allow an object to alter its behavior when its internal state
changes. The object will appear to change its class.
![alt text](./etc/state_1.png "State")
**Applicability:** Use the State pattern in either of the following cases
## Applicability
Use the State pattern in either of the following cases
* an object's behavior depends on its state, and it must change its behavior at run-time depending on that state
* operations have large, multipart conditional statements that depend on the object's state. This state is usually represented by one or more enumerated constants. Often, several operations will contain this same conditional structure. The State pattern puts each branch of the conditional in a separate class. This lets you treat the object's state as an object in its own right that can vary independently from other objects.
**Credits**
## Credits
* [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)