Passing int[][] as generic parameter











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public static <T> void func1(T arr) {

    ...

}






public static <T> void func2(T arr) {

    ...

}


I'm trying to pass a 2-dimensional array, int arr.



I cannot use func1(arr) , but I can use func2(arr)



Can someone explain me how this works?






java generics methods parameters parameter-passing







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    up vote
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    public static <T> void func1(T arr) {
    
    ...
    
}
    





    public static <T> void func2(T arr) {
    
    ...
    
}


    I'm trying to pass a 2-dimensional array, int arr.



    I cannot use func1(arr) , but I can use func2(arr)



    Can someone explain me how this works?






    java generics methods parameters parameter-passing







    share|improve this question


























      up vote
      10
      down vote

      favorite
      2









      up vote
      10
      down vote

      favorite
      2






      2





      public static <T> void func1(T arr) {
      
    ...
      
}
      





      public static <T> void func2(T arr) {
      
    ...
      
}


      I'm trying to pass a 2-dimensional array, int arr.



      I cannot use func1(arr) , but I can use func2(arr)



      Can someone explain me how this works?






      java generics methods parameters parameter-passing







      share|improve this question















      public static <T> void func1(T arr) {
      
    ...
      
}
      





      public static <T> void func2(T arr) {
      
    ...
      
}


      I'm trying to pass a 2-dimensional array, int arr.



      I cannot use func1(arr) , but I can use func2(arr)



      Can someone explain me how this works?






      java generics methods parameters parameter-passing




      java generics methods parameters parameter-passing






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited yesterday









      Muntasir

      6021818




      6021818










      asked 2 days ago









      Sumit Das

      524615




      524615
























          2 Answers
          2






          active

          oldest

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          up vote
          20
          down vote













          T represents an array of some generic object. Any array type (including int) is an object. Therefore, int is a valid T when T = int.



          However, because int is not an object, int is not a valid T.






          share|improve this answer

















          • 4




            To expand on this, you could change it to Integer arr; and it should work.
            – LadyCailin
            2 days ago






          • 3




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            2 days ago


















          up vote
          1
          down vote













          If you you use Integer instead of int, you should be able to:




          • call func1 with Integer arr

          • call func2 with Integer arr or Integer arr






          share|improve this answer























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            2 Answers
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            active

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            2 Answers
            2






            active

            oldest

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            active

            oldest

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            active

            oldest

            votes








            up vote
            20
            down vote













            T represents an array of some generic object. Any array type (including int) is an object. Therefore, int is a valid T when T = int.



            However, because int is not an object, int is not a valid T.






            share|improve this answer

















            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              2 days ago






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              2 days ago















            up vote
            20
            down vote













            T represents an array of some generic object. Any array type (including int) is an object. Therefore, int is a valid T when T = int.



            However, because int is not an object, int is not a valid T.






            share|improve this answer

















            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              2 days ago






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              2 days ago













            up vote
            20
            down vote










            up vote
            20
            down vote









            T represents an array of some generic object. Any array type (including int) is an object. Therefore, int is a valid T when T = int.



            However, because int is not an object, int is not a valid T.






            share|improve this answer












            T represents an array of some generic object. Any array type (including int) is an object. Therefore, int is a valid T when T = int.



            However, because int is not an object, int is not a valid T.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 2 days ago









            Joe C

            9,81352341




            9,81352341








            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              2 days ago






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              2 days ago














            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              2 days ago






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              2 days ago








            4




            4




            To expand on this, you could change it to Integer arr; and it should work.
            – LadyCailin
            2 days ago




            To expand on this, you could change it to Integer arr; and it should work.
            – LadyCailin
            2 days ago




            3




            3




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            2 days ago




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            2 days ago












            up vote
            1
            down vote













            If you you use Integer instead of int, you should be able to:




            • call func1 with Integer arr

            • call func2 with Integer arr or Integer arr






            share|improve this answer



























              up vote
              1
              down vote













              If you you use Integer instead of int, you should be able to:




              • call func1 with Integer arr

              • call func2 with Integer arr or Integer arr






              share|improve this answer

























                up vote
                1
                down vote










                up vote
                1
                down vote









                If you you use Integer instead of int, you should be able to:




                • call func1 with Integer arr

                • call func2 with Integer arr or Integer arr






                share|improve this answer














                If you you use Integer instead of int, you should be able to:




                • call func1 with Integer arr

                • call func2 with Integer arr or Integer arr







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 2 days ago

























                answered 2 days ago









                TeeKea

                833617




                833617






























                     

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