Command design pattern is a behavioral design pattern. We use it to

encapsulate all the information required to trigger an event. Some of

the main uses of Command pattern are:

1. Graphic User Interface (GUI): In GUI and menu items, we

use command pattern. By clicking a button we can read the

current information of GUI and take an action.

2. Macro Recording: If each of user action is implemented as

a separate Command, we can record all the user actions in

a Macro as a series of Commands. We can use this series

to implement the “Playback” feature. In this way, Macro

can keep on doing same set of actions with each replay.

3. Multi-step Undo: When each step is recorded as a

Command, we can use it to implement Undo feature in

which each step can by undo. It is used in text editors like

MS-Word.

4. Networking: We can also send a complete Command over

the network to a remote machine where all the actions

encapsulated within a Command are executed.

5. Progress Bar: We can implement an installation routine as

a series of Commands. Each Command provides the

estimate time. When we execute the installation routine,

with each command we can display the progress bar.

6. Wizard: In a wizard flow we can implement steps as

Commands. Each step may have complex task that is just

implemented within one command.

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