Re: Math.random()


maya wrote:
maya wrote:
Jeff Higgins wrote:
Daniel Pitts wrote:
maya wrote:
(I want to have option of displaying photos in a random order instead
of in order of img-names (1.jpg, 2.jpg, 3.jpg, etc..))

Try putting the photos into a List object, and then calling
Collections.shuffle() with that list object as the parameter.

A clear winner. :-))


ok, am trying to do this now.. acc to docs it's like a vector except
"synchronized" (not sure what this means..) only thing in Vector you add
elements thus:

vPhotos.addElement(imgsList[i]);

but am having problems here:

ArrayList photos = new ArrayList(); File directory = new
File(System.getProperty("user.dir"));
String[] textFileNames = directory.list(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(".jpg") || name.endsWith( ".JPG");
}
});
for (int i=0; i < textFileNames.length+1; i++) {
photos.add(i); // error here...

photos.add(new File(i));

}


how do I convert this "i" to an object (since this method takes only obj
as argument..)

and then how do I apply Collections.shuffle() to it??

photos.Collections.shuffle() ?? I dont think so....;)

I really need this today, for some photos I'm putting together for a
friend overseas, sending with a friend who travels today....

thank you very much..



ok, I think got Collections.shuffle() part..

Collections.shuffle(photos, new Random());

only problem now is how to add all nos. to ArrayList (this has to be 1.4
construction, not 1.5..)

and then how to go from Collections.shuffle to this:

for (int i = 0; i < textFileNames.length; ++i) {
File oldFile = new File(textFileNames[i]);
posDot = textFileNames[i].indexOf(".");
_temp = textFileNames[i].substring(0,posDot);
File newFile = new File(i+1 + ".jpg");
oldFile.renameTo(newFile);
}

so imgs are named with nos. at random (i.e., so imgs, after renamed, are
in diff order from orig ones..)


thank you....



.

Relevant Pages

  • Re: Math.random()
    ... Try putting the photos into a List object, and then calling Collections.shufflewith that list object as the parameter. ... only problem now is how to add all nos. ... so imgs are named with nos. ...
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