Java-Gaming.org Hi !
Featured games (90)
games approved by the League of Dukes
Games in Showcase (741)
Games in Android Showcase (225)
games submitted by our members
Games in WIP (823)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  How to initalize a 2D array?  (Read 2096 times)
0 Members and 1 Guest are viewing this topic.
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:
1  
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:
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
    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 »

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

etc...

http://www.grafixator.com  2D Game Editor + Random Graphics Generator
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:
1  
int[] i = new int[][]

I believe it should be:
1  
int[][] i = new int[][]

Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
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

1  
2  
3  
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

1  
2  
3  
4  
5  
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
Pages: [1]
  ignore  |  Print  
 
 

 
Ecumene (110 views)
2017-09-30 02:57:34

theagentd (136 views)
2017-09-26 18:23:31

cybrmynd (245 views)
2017-08-02 12:28:51

cybrmynd (241 views)
2017-08-02 12:19:43

cybrmynd (240 views)
2017-08-02 12:18:09

Sralse (254 views)
2017-07-25 17:13:48

Archive (864 views)
2017-04-27 17:45:51

buddyBro (1008 views)
2017-04-05 03:38:00

CopyableCougar4 (1568 views)
2017-03-24 15:39:42

theagentd (1373 views)
2017-03-24 15:32:08
List of Learning Resources
by elect
2017-03-13 14:05:44

List of Learning Resources
by elect
2017-03-13 14:04:45

SF/X Libraries
by philfrei
2017-03-02 08:45:19

SF/X Libraries
by philfrei
2017-03-02 08:44:05

SF/X Libraries
by SkyAphid
2017-03-02 06:38:56

SF/X Libraries
by SkyAphid
2017-03-02 06:38:32

SF/X Libraries
by SkyAphid
2017-03-02 06:38:05

SF/X Libraries
by SkyAphid
2017-03-02 06:37:51
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!