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                            # 概念
* 隨時記錄一個對象的狀態變化
* 隨時可以恢復之前的某個狀態（如撤銷功能）

# 設計原則驗證
* 狀態對象與使用者分開，解耦
* 符合開放封閉原則
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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