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                            # 類的繼承
1. 什么是繼承？請舉例說明。
2. 方法簽名是什么意思？ 
3. 什么是方法重載？ 什么是方法的重寫？
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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