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Java List vs ArrayList

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有刺的猬
有刺的猬 2020-12-07 01:14

As a C++ oldtimer I have managed to solve my problem but I can not wrap my head around the underlying Java mechanisms here: 

Vector x = new Vec         


        
                      

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                  北荒        
                
              
    
                            
    
                2020-12-07 02:03
              
    
            
    
            
    
                                                                       

    Yes.
Because List is an Interface and in Java you cannot instantiate an Interface.
You can only instantiate a class.
    


    ArrayList is a class that's implementing List<> that's why you can instantiate it.
:)
    
                                                                        
    
                                                        
    
            
    
            
    
              
                
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