Complete example of the command design pattern in Java 10+
The implementation includes 5 classes. In the example in the repository, Profile has a biography. The class SetProfileBiographyCommand wraps the Profile's setBiography() method. The Profile is a instance of Receiver.
The main() method in the Main class includes an example where a biography is set a couple of times and then the set is undone, discarding the made changes. The concrete command class inherits the Command interface by forcing to override a execute method. The execute method in the class will initiate the desired notion. The fields and constructor all support the execute method by allowing the storage of parameters. Both fields are labelled as private because their values won't change after the definition in the constructor.
The image below shows how the design command pattern maps to the examples used in this repository.
A concern arising from this methodology is how memory intensive this process may be. An easy solution may be to allow a specified number of commands in the history list, e.g. 10. In this case, regarding a specific invoker, there will be 10 Profile objects and 10 String objects stored in memory maximum.
See LICENSE.md for more information.