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  How to initalize a 2D array?  (Read 2438 times)
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Offline CyanPrime
« Posted 2009-09-25 07:04:43 »

I'm trying to initalize a 2D array at creation. I know that for a single array you go:
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int[] i = new int[]{0,1,2,3,4,5,6};


but how do you do it for a 2D array? This is what I got so far:
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    int[] i = new int[][]{{0,1,0,1,0,1,0,1,0,1},
                     {1,0,1,0,1,0,1,0,1,0},
                     {0,1,0,1,0,1,0,1,0,1},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0},
                     {0,0,0,0,0,0,0,0,0,0}};
Offline steveyO
« Reply #1 - Posted 2009-09-25 07:25:52 »

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int i[][] = {{0,1,0,1,0,1,0,1,0,1},

etc...

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Offline JL235

JGO Coder


Medals: 10



« Reply #2 - Posted 2009-09-25 07:49:25 »

It all looks correct to me, except with the bit:
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int[] i = new int[][]

I believe it should be:
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int[][] i = new int[][]

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Offline Stranger
« Reply #3 - Posted 2009-09-25 11:10:44 »

Here is info about Java arrays.

Anton
Offline ManaSink

Senior Newbie





« Reply #4 - Posted 2009-09-25 14:24:08 »


Yeah.  That one trips up C/C++ guys all the time.  Keep in mind that arrays are objects, so the first dimension is an array of references.  Means an index can contain nulls or reference any int array, including ones of different lengths, or the same array.

lol, Stranger's link has it right in a couple of places, but shows the same mistake in the initializing arrays section.   Roll Eyes

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int[] oneDim = new int[]{1,2,3};
int[][] twoDim = new int[][]{{1,2,3},{4,5,6},{7,8,9}};
int[][] weirdButLegal = new int[][]{null, oneDim, oneDim , twoDim[1],{7,8,9,10,11,12,13,14,15}};

Offline CyanPrime
« Reply #5 - Posted 2009-09-25 16:50:11 »

Alright, thanks everyone! ^_^
Offline rdcarvallo

Senior Devvie


Projects: 5
Exp: 15 years


2D Java games forever!


« Reply #6 - Posted 2009-09-25 19:38:31 »

Only last year I got the idea of using the intermediate references in 2D arrays.

great solution for row swaping Grin

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void swap(int[][] a, int x, int y){
  int[] t = a[x];
  a[x] = a[y];
  a[y] = t;
}


before understading this, I iterated the array, copying the values.  persecutioncomplex
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