Multiple choice java

Which one of the following type-oriented statements is incorrect?





    

      
    
            
  1. 
              
    User-defined types are also known as reference types.
    
    
            
    2. 
            
  2. 
              
    User-defined types are only defined via classes and interfaces.
    
    
            
    3. 
            
  3. 
              
    An array type is signified by an identifier and one or more pairs of square brackets.
    
    
            
    4. 
            
  4. 
              
    The declaration int[] x; introduces an array type.
    
    
            
    5. 
      

    


    

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        B
        Correct answer
      

        

          Explanation
          

            
In Java, user-defined types are reference types, but they are not limited to classes and interfaces. Enums and annotation types are also user-defined types. Furthermore, arrays are reference types but are not 'defined' by the user in the same way classes are, making the statement technically incorrect.


          

        

    

  



          

      
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