Command Design Pattern with Java Coding for Beginners | Command Pattern Explained

Command is a behavioral design pattern that turns a request into a stand-alone object that contains all information about the request. This transformation lets you pass requests as a method arguments, delay or queue a request’s execution, and support undoable operations.

The Command pattern is used to create objects that represent actions and events in an application. A command object encapsulates an action (event) and contains all information required to understand exactly what has happened. The Command pattern forwards requests along a chain of classes, but the Command pattern forwards a request only to a specific module. It encloses a request for a specific action inside an object and gives it a known public interface.

** Where to use Command Design Pattern **
1. Where you want an action that can be represented in many ways, like dropdown menu, buttons and popup menu.
2. To create undo/redo functionality by reusing the code and command object.

** Advantages of Command Design Pattern **
1. A command object is a possible storage for procedure parameters. It can be used while assembling the parameters for a function call and allows the command to be set aside for later use.
2. A class is a suitable place to collect code and data related to a specific action or event.
3. It allows the reaction to a command to be executed some time after it has occurred.
4. Command objects enable data structures containing multiple commands.
5. Command objects support undoable operations, provided that the command objects are stored (for example in a linked list).

** Topics Covered **
1. Recap of Chain of Responsibility Design Pattern
2. Introduction of Command Design Pattern
3. Usage of Command Design Pattern
4. Example of Command Design Pattern
5. Java Code Implementation of Command Design Pattern
6. Advantage of Command Design Pattern
7. Summary of Command Pattern

#commandpattern #commanddesignpattern #javadesignpatterns

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** Acronyms **
OOP – Object Oriented Programming Languages
GOF – Gang of Four Design Pattern
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