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                            # 介紹
* 系統中被唯一使用
* 一個類只有一個實例

# 設計原則驗證
* 符合單一職責原則，只實例化唯一的一個對象
* 沒法具體體現開放封閉原則，但是絕對不違反開放封閉原則
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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