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Dart是一種面向對象的語言，具有類和基于mixin的繼承。每個對象都是一個類的實例，所有的類都是Object的子類。基于mixin的繼承意味著，盡管每個類(除了Object)都只有一個超類，但類主體可以在多個類層次結構中重用。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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