How to Build a Memento design pattern using java with example

The memento pattern is implemented with three objects: the originator, a caretaker and a memento. The originator is some object that has an internal state. The caretaker is going to do something to the originator, but wants to be able to undo the change. The caretaker first asks the originator for a memento object. 

00:00 Introduction to Memento design pattern
01:12 Coding Example

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