Well, one problem I see is you don't initialize your fileList. It's set to null
and remains this way for the duration of the method.
You might try this:
public static List<File> ListFile(File filepath) {
List<File>fileList = new ArrayList<File>();
File[] file = filepath.listFiles();
for (File f:file) {
if(f.isFile())
fileList.add(f);
if (f.isDirectory())
ListFile(f);
}
return fileList;
}
There could be other problems (e.g., the recursion could be a probem? Don't you
want to add the results to the fileList getting returned when you call ListFile
within the f.isDirectory() test?), but that's the most obvious to me.
~Karl
--- On Mon, 7/20/09, fantasticfour <fantasticf...@126.com> wrote:
> From: fantasticfour <fantasticf...@126.com>
> Subject: [java ee programming] Is there something wrong with my code?
> To: "java-ee-j2ee-programming-with-passion"
> <java-ee-j2ee-programming-with-passion@googlegroups.com>
> Date: Monday, July 20, 2009, 9:24 AM
> Hi,everyone,i have trouble with
> following code,which is for listing all file in a filepath
>
> public static ArrayList<File> ListFile(File
> filepath) {
> ArrayList<File> fileList = null;
> File[] file = filepath.listFiles();
> for (File f:file) {
> if(f.isFile())
> fileList.add(f);
> if (f.isDirectory())
> ListFile(f);
> }
> return fileList;
> }
> Thanks !
>
>
>
>
> 网易YEAH.NET免费邮箱：您的终身免费邮箱
>
>
> >
>
>
>
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