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Java Generics: List, List<Object>, List<?>

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你的背包 2020-11-22 17:08

Can someone explained, as detailed as possible, the differences between the following types?

List
List
List



Let me m         


        
      
      
      

        

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                 谎友^ 
              
              
    
                
                   谎友^
                                             
                
                
                (楼主)
            
              
                  
    
                2020-11-22 18:08
              
    

            
    
            
    
              
              

    I'd put it this way: While List and List can contain any type of objects, List contains elements of an unknown type, but once that type is captured, it can only contain elements of that type. Which is why it is the only type safe variant of those three, and therefore generally preferable.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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