david wrote:
> Yeah, I just did some research about this issue and find the same as
> you suggested.
> This is my second program with the JAVA, I need to use it to write
> several programs that would be cross-platform. And at the same time I
> reading one small book, it will take several weeks before I will be
> able to understand the idea of the JAVA better. But I it looks that I
> capable of writing JAVA code, just maybe it's abit too much objective,
> that means you need to know more about the standard cl*****.
The basic idiom for emulating pass by reference is to wrap the value in
an array.
public void someMethod( int w[] )
{
w[0] = 42;
}
will let you set v to 42 when called like this:
int v = 0;
someMethod( new int[] {v} );
But it's very awkward because you already have an array. (It's even
pretty awkward when you don't have an array.) A better method might be
to do as Lew suggests and just wrap your array in a class
public class BoolMatrix {
private boolean m [][];
public void resetSize( int x, int y ) {
m = new boolean[x][y];
}
}
Now things will work much more like you'd expect.
BoolMatrix n = new BoolMatrix();
int size = 42;
someOtherMethod( n, size );
// ...
public void someOtherMethod( BoolMatrix x, int size )
{
x.resetSize( size, size );
}
This is much clearer to read and debug, I think. Few surprises here, at
least until you get into multiple threads... ;)
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