Command

The Command design pattern encapsulates a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.

Usage          Medium-low

UML class diagram

A visualization of the classes and objects participating in this pattern.

Sample code

This structural code demonstrates the Command pattern which stores requests as objects allowing clients to execute or playback the requests.

Output

See also

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• Common Design Patterns
• Design Guidelines
• Documentation