Re: systematic file(s) deletion

"Oliver Wong" <>
Fri, 29 Dec 2006 16:15:57 -0500
"NickName" <> wrote in message

Oliver Wong wrote:

"NickName" <> wrote in message

                              long ftime = fd.lastModified();
       // test output of the file day value
       // result: 0
       // comment: bad
       // question: what's wrong?

    This is much better. See the javadocs

    A long value representing the time the file was last modified,
in milliseconds since the epoch (00:00:00 GMT, January 1, 1970), or 0L if
the file does not exist or if an I/O error occurs

    So either the file does not exist, or an I/O error occurred. Did you
checking the output of fd.exists() ?

Ok, I now changed the code to the following (please see embeded
comments) below:

                   // list files
                  // the Temp directory has 10 files, of which one
file name includes white spaces

                      File dir = new File("Temp");

                      String[] children = dir.list();
                      if (children == null) {

                      } else {
                          for (int i = 0; i < children.length; i++) {

                              String filename = children[i];

                         // test file existence
                            boolean exist = (new
                             if (exist) {
                             else {
                          System.out.println("file instantiation
failed for " + filename +
"why? because it has already been instantiated?");


Thanks. Would this technique not be able to solve this problem?

    I'm not sure what problem you're referring to when you say "this
problem". It won't magically create a file, if that's the problem you're
trying to solve. Not that whether or not a file exists on the file system
has nothing to do with the JVM's instantiation of objects. Consider this
example code to gain some enlightment as to what the exist() does:

public class Example {

  public static boolean checkFileExists(String pathToFile) {
    File temp = new File(pathToFile);
    return temp.exists();

  public static void main(String[] args) {
    if (checkFileExists("C:/autoexec.bat")) {
      System.out.println("You have an autoexec.bat file in the root of your
C drive.");
    } else {
      System.out.println("You don't have an autoexec.bat file in the root of
your C drive.");

    Notice that this program always instantiates exactly 1 file object,
regard of whether or not you have an autoexec.bat file on your file system.

    - Oliver

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