File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes arraycopy Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of REST with Spring (video course) this week in the Spring forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "arraycopy" Watch "arraycopy" New topic


Gerry Martin

Joined: Jul 31, 2001
Posts: 5
I am try to manipulate an 2D array, into a 1D array, but must also flip the 2D array, so that the last element of the 2D array is now the first element of the 1D array.
Sorta like a nested loop, where:
1D[0] = 2D[5][10];
1D[50] = 2D[0][0];
The arrays that I have to flip are used to draw an image using MemoryImageSource, so they are quite large(512x1024).
Is it posible to use arraycopy to get better performance in this situtation.
Mo Ibrahim

Joined: Jul 10, 2001
Posts: 28
I think arrayCopy() is a native call and if I am right, it should be faster than a loop.
Gerry Martin

Joined: Jul 31, 2001
Posts: 5
Arraycopy is faster than a loop, but how would you use arraycopy to convert a 2d array, into a 1d array, where the last element of the 2d array is the first elemet of the 1d array.
Ranch Hand

Joined: Nov 22, 2008
Posts: 18944
For what you want to do, it sounds like a loop is your best bet.
I agree. Here's the link:
subject: arraycopy
It's not a secret anymore!