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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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                 慢半拍i 
              
              
    
                
                   慢半拍i
                                             
                
                
                (楼主)
            
              
                  
    
                2020-12-07 01:57
              
    

            
    
            
    
              
              

    List isn't class it's an Interface and you can't instantiate the interface object.
    


    ArrayList is the class which was implement the List interface so can able to instantiate the ArrayList object and assign to the List object
    
    
    
             
    
                                                        
    
            
    
            
    
              
                
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