2 dimensional array of objects??

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projektwi-05@yahoo.de - 02 Jan 2006 21:30 GMT

Hi,

I want to program a 2 dimensional array of objects. So far I've got
following code snippet (note node is not finished yet just a skeleton):

class node
    {
        int id,u,l,r,d;

    }

public void run () {

    node [][] gamefield = new node[getWidth()][getHeight()];

    for (int laufx=0; laufx < gamefield.length; laufx++)
{
gamefield[laufx] = new node[ gamefield[laufx].length ];
for (int laufy=0; laufy < gamefield[laufx].length; laufx++)
    {
        gamefield[laufx][laufy] = new node;
    };
};

}

Java complains:

in_extension.java:38: '(' or '[' expected
gamefield[laufx][laufy] = new node;
^
1 error

So whats wrong here? I only want to assign one reference to a node
object nothing else. Googled already, but I found no example or
explanation. All I need is 2 dimensional array containing node
objects..

Any suggestions??

Thanks in advance

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VisionSet - 02 Jan 2006 21:40 GMT

> in_extension.java:38: '(' or '[' expected
> gamefield[laufx][laufy] = new node;
> ^
> 1 error
>
> So whats wrong here?

gamefield[laufx][laufy] = new node();

Class names begin with uppercase letters, please fix this!

--
Mike W

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Mark Thomas - 02 Jan 2006 22:16 GMT

> Hi,
>
[quoted text clipped - 10 lines]
>
> node [][] gamefield = new node[getWidth()][getHeight()];

at this point you have your two dimensional array of nodes

> for (int laufx=0; laufx < gamefield.length; laufx++)

Here gamefield.length will give you the size of the first dimension of
your array (from getWidth() above). If you need it, gamefield[0].length
will give the other dimension.

> {
> gamefield[laufx] = new node[ gamefield[laufx].length ];

Whoops! Here you are creating another single dimension array (which I
don't think you need, and then trying to assign it to a cell in your
original array - but to do that you would need to specify both indices -
something like gamefield[x,y].

> for (int laufy=0; laufy < gamefield[laufx].length; laufx++)
> {
> gamefield[laufx][laufy] = new node;

new node(); to call node's constructor. Note that convention has it
that class names should start with a capital letter, so Node would be a
better name than node.

> };
> };
[quoted text clipped - 14 lines]
>
> Any suggestions??

node [][] gamefield = new node[getWidth()][getHeight()];
for (int laufx=0; laufx < gamefield.length; laufx++)
{
for (int laufy=0; laufy < gamefield[laufx].length; laufx++)
{
gamefield[laufx][laufy] = new node();
}
}

would create your array and fill it with default nodes.

Mark

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Roedy Green - 03 Jan 2006 00:38 GMT

>I want to program a 2 dimensional array of objects. So far I've got
>following code snippet (note node is not finished yet just a skeleton):

see http://mindprod.com/jgloss/gotchas.html#MATRIX

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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2 dimensional array of objects??

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