The memento design pattern saves an object's current internal state as a memento so that it can be referred to and restored to. If you have ever used Ctrl + Z (Windows) or Cmd + Z (Mac) to undo a change, you were restoring to a previous state using the memento design pattern. A benefit of using this design pattern is that we honor encapsulation, providing data protection.
We will look at an example use case, the UML class diagram, and the source code necessary to implement the memento design pattern for this scenario.
