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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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ca6bb7a3
编写于
10月 03, 2015
作者:
I
Ilkka Seppala
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memento/src/main/java/com/iluwatar/memento/App.java
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@@ -4,7 +4,20 @@ import java.util.Stack;
/**
*
* Memento pattern is for storing and restoring object state. The object ({@link Star})
* The Memento pattern is a software design pattern that provides the ability to restore
* an object to its previous state (undo via rollback).
* <p>
* 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. Then it does whatever operation
* (or sequence of operations) it was going to do. To roll back to the state before the
* operations, it returns the memento object to the originator. The memento object itself
* is an opaque object (one which the caretaker cannot, or should not, change). When using
* this pattern, care should be taken if the originator may change other objects or
* resources - the memento pattern operates on a single object.
* <p>
* In this example the object ({@link Star})
* gives out a "memento" ({@link StarMemento}) that contains the state of the object.
* Later on the memento can be set back to the object restoring the state.
*
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