© Vaskaran Sarcar 2019
Vaskaran SarcarJava Design Patternshttps://doi.org/10.1007/978-1-4842-4078-6_17

17. Command Pattern

Vaskaran Sarcar1 
Bangalore, Karnataka, India

This chapter covers the command pattern.

GoF Definition

Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queues, or log requests, and supports undoable operations.


Here you encapsulate a method invocation process. In general, four terms are associated: invoker, client, command, and receiver. A command object can invoke a method of the receiver in a way that is specific to that receiver’s class. The receiver then starts processing the job. A command object is separately passed to the invoker object to invoke the command. The ...

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