Passing int[][] as generic parameter











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down 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?










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    up vote
    14
    down vote

    favorite
    3












    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?










    share|improve this question


























      up vote
      14
      down vote

      favorite
      3









      up vote
      14
      down vote

      favorite
      3






      3





      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?










      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






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 18 at 9:54









      Muntasir

      6041818




      6041818










      asked Nov 17 at 21:12









      Sumit Das

      544615




      544615
























          2 Answers
          2






          active

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          up vote
          23
          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
            Nov 17 at 22:28






          • 3




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            Nov 18 at 6:25


















          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
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            23
            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
              Nov 17 at 22:28






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              Nov 18 at 6:25















            up vote
            23
            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
              Nov 17 at 22:28






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              Nov 18 at 6:25













            up vote
            23
            down vote










            up vote
            23
            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 Nov 17 at 21:14









            Joe C

            10.1k52341




            10.1k52341








            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              Nov 17 at 22:28






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              Nov 18 at 6:25














            • 4




              To expand on this, you could change it to Integer arr; and it should work.
              – LadyCailin
              Nov 17 at 22:28






            • 3




              @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
              – user1643723
              Nov 18 at 6:25








            4




            4




            To expand on this, you could change it to Integer arr; and it should work.
            – LadyCailin
            Nov 17 at 22:28




            To expand on this, you could change it to Integer arr; and it should work.
            – LadyCailin
            Nov 17 at 22:28




            3




            3




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            Nov 18 at 6:25




            @LadyCailin true, but in most cases when you need multi-dimensional arrays, it is really bad idea to use wrapper types
            – user1643723
            Nov 18 at 6:25












            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 Nov 18 at 0:55

























                answered Nov 17 at 23:56









                TeeKea

                1,97811223




                1,97811223






























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