[matLab]

How would i go about making a full 2D array copy as what I have tried below does not seem to work

private PixelColour[][] makeAFullCopy(PixelColour[][] currentPixels2D) {
		userChangedPixels2D = new PixelColour[numberOfRows][numberOfCols];
		for(int r = 0; r < numberOfRows; r++){
			for(int c = 0; c < numberOfCols; c++){
				numberOfRows = currentPixels2D.length;
				numberOfCols = currentPixels2D[0].length;
				userChangedPixels2D[r][c] = currentPixels2D[r][c];
			}
		}
		return userChangedPixels2D;
	}

This post has been edited by matLab: 16 August 2009 - 07:19 PM

[oQMr FoxQo]

send all the code plz

[syfran]

Are you looking for a deep or shallow copy?

Quote

userChangedPixels2D = new PixelColour[numberOfRows][numberOfCols];

You need to give the userChanged one a type to start with.
Also, post any errors you are getting.

This post has been edited by syfran: 16 August 2009 - 08:09 PM

[pbl]

The Array class might have a method to that automatically but this will work

PixelColor[][] makeCopy(PixelColor[][] p) {
	PixelColor tmp = new PixelColor[p.length][];
	 for(i = 0; i < p.length; i++) {
		tmp[i] = new PixelColor[p[i].length];
		for(int j = 0; j < p[i].length; j++)
		   tmp[i][j] = p[i][j];
	}
	return tmp;
}

[pbl]

Neumann, on 16 Aug, 2009 - 07:55 PM, said:

PixelColor[][] makeCopy(PixelColor[][] p) {
   return (PixelColor[][])p.clone();
}

How dum I am
If PixelColor implements Clonable sure

[matLab]

Thanks pbl and Neumann both of your ways work but I don't believe we have been told about cloning so i will stick with pbl's way.

Does pbl's way make a deep copy?

This post has been edited by matLab: 16 August 2009 - 09:39 PM

[syfran]

Neumann, on 16 Aug, 2009 - 08:34 PM, said:

pbl, on 16 Aug, 2009 - 08:10 PM, said:

How dum I am
If PixelColor implements Clonable sure

Clone() simply creates a shallow copy of array's contents. PixelColor need not implement Clonable.

Someone should write a tutorial on all this clone/cloneable stuff. It seems to be one of the gotchas of java. As soon as I think I understand it I realize I really don't.

[matLab]

How would you go about preforming a deep copy as I am curious to see whether or not that would work better.

EDIT: Don't worry I now think a shallow copy will work

This post has been edited by matLab: 16 August 2009 - 10:00 PM

[matLab]

Yes Neumann I was thinking the same thing.

To satisfy my curiosity I will just google it.

This post has been edited by matLab: 16 August 2009 - 10:04 PM