Python 方式：
# Memento Pattern with Python Code from abc import abstractmethod,ABCMeta # 创建Memento类 class Memento(): _state = "" def __init__(self,strState): self._state = strState def getState(self): return self._state # 创建Originator类 class Originator(): _state = "" def setState(self,strState): self._state = strState def getState(self): return self._state def saveStateToMemento(self): return Memento(self._state) def getStateFromMemento(self,inMemento): self._state = inMemento.getState() # 创建CareTaker类 class CareTaker(): _mementoList = [] def add(self,inMemento): self._mementoList.append(inMemento) def get(self,inIndex): return self._mementoList[inIndex] # 调用输出 if __name__ == '__main__': originator = Originator() careTaker = CareTaker() originator.setState("State #1") originator.setState("State #2") careTaker.add(originator.saveStateToMemento()) originator.setState("State #3") careTaker.add(originator.saveStateToMemento()) originator.setState("State #4") print("Current State: " + originator.getState()) originator.getStateFromMemento(careTaker.get(0)) print("First saved State: " + originator.getState()) originator.getStateFromMemento(careTaker.get(1)) print("First saved State: " + originator.getState())
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