java-design-patterns/memento/index.md

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layout	title	folder	permalink	categories	tags
pattern	Memento	memento	/patterns/memento/	pattern_cat	pattern_tag

Intent: Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.

Applicability: Use the Memento pattern when

• a snapshot of an object's state must be saved so that it can be restored to that state later, and
• a direct interface to obtaining the state would expose implementation details and break the object's encapsulation

Real world examples:

• java.util.Date