Getting the filenames of all files in a folder

Question

I need to create a list with all names of the files in a folder   For example  if I have   000 jpg 012 jpg 013 jpg   I want to store them in a ArrayList with  000 012 013  as values   What s the best way to do it in Java    PS  I m on Mac OS X

User · Answer

Here s how to look in the documentation   First  you re dealing with IO  so look in the java io package    There are two classes that look interesting  FileFilter and FileNameFilter  When I clicked on the first  it showed me that there was a a listFiles   method in the File class  And the documentation for that method says      Returns an array of abstract pathnames   denoting the files in the directory   denoted by this abstract pathname    Scrolling up in the File JavaDoc  I see the constructors  And that s really all I need to be able to create a File instance and call listFiles   on it  Scrolling still further  I can see some information about how files are named in different operating systems

User · Answer

Create a File object  passing the directory path to the constructor  Use the listFiles   to retrieve an array of File objects for each file in the directory  and then call the getName   method to get the filename   List lt String gt  results   new ArrayList lt String gt       File   files   new File   path to the directory   listFiles      If this pathname does not denote a directory  then listFiles   returns null    for  File file   files        if  file isFile              results add file getName

User · Answer

You could do it like that   File folder   new File  your path    File   listOfFiles   folder listFiles     for  int i   0  i  lt  listOfFiles length  i        if  listOfFiles i  isFile          System out println  File     listOfFiles i  getName         else if  listOfFiles i  isDirectory          System out println  Directory     listOfFiles i  getName             Do you want to only get JPEG files or all files

[java] Getting the filenames of all files in a folder

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