Passing int[][] as generic parameter

up vote
18
down vote

favorite

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?

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

add a comment |

up vote
18
down vote

favorite

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?

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

add a comment |

up vote
18
down vote

favorite

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?

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

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

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

edited Nov 18 at 9:54

Muntasir

6081818

edited Nov 18 at 9:54

Muntasir

6081818

edited Nov 18 at 9:54

Muntasir

6081818

asked Nov 17 at 21:12

Sumit Das

564615

asked Nov 17 at 21:12

Sumit Das

564615

asked Nov 17 at 21:12

Sumit Das

564615

add a comment |

2 Answers
2

active

oldest

votes

up vote
24
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.

answered Nov 17 at 21:14

Joe C

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

add a comment |

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

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
24
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.

answered Nov 17 at 21:14

Joe C

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

add a comment |

up vote
24
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.

answered Nov 17 at 21:14

Joe C

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

add a comment |

up vote
24
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.

answered Nov 17 at 21:14

Joe C

10.1k52341

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.

answered Nov 17 at 21:14

Joe C

10.1k52341

answered Nov 17 at 21:14

Joe C

10.1k52341

answered Nov 17 at 21:14

Joe C

10.1k52341

answered Nov 17 at 21:14

Joe C

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

add a comment |

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

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

@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

add a comment |

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

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

add a comment |

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

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

add a comment |

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

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

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

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

edited Nov 18 at 0:55

answered Nov 17 at 23:56

TeeKea

2,21741228

answered Nov 17 at 23:56

TeeKea

2,21741228

answered Nov 17 at 23:56

TeeKea

2,21741228

add a comment |

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