How to create a directory in Java

Question

How do I create Directory folder   Once I have tested System getProperty  user home     I have to create a directory  directory name  new folder    if and only if new folder does not exist

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Though this question has been answered  I would like to put something extra  i e   if there is a file exist with the directory name that you are trying to create than it should prompt an error  For future visitors    public static void makeDir         File directory   new File   dirname         if  directory exists    amp  amp  directory isFile                  System out println  The dir with name could not be              created as it is a normal file              else               try                       if   directory exists                                  directory mkdir                              String username   System getProperty  user name                String filename     path     username     txt     extension if you need one                    catch  IOException e                        System out println  prompt for error

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For java 7 and up    Path path   Paths get   your path string    Files createDirectories path     It seems unnecessary to check for existence of the dir or file before creating  from createDirectories javadocs       Creates a directory by creating all nonexistent parent directories first  Unlike the createDirectory method  an exception is not thrown if the directory could not be created because it already exists    The attrs parameter is optional file-attributes to set atomically when creating the nonexistent directories  Each file attribute is identified by its name  If more than one attribute of the same name is included in the array then all but the last occurrence is ignored       If this method fails  then it may do so after creating some  but not all  of the parent directories

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With Java 7  you can use Files createDirectories     For instance   Files createDirectories Paths get   path to directory

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Neat and clean   import java io File   public class RevCreateDirectory        public void revCreateDirectory               To create single directory folder         File file   new File  D   Directory1            if   file exists                  if  file mkdir                      System out println  Directory is created                   else                   System out println  Failed to create directory                                       To create multiple directories folders         File files   new File  D   Directory2  Sub2  Sub-Sub2            if   files exists                  if  files mkdirs                      System out println  Multiple directories are created                   else                   System out println  Failed to create multiple directories

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This function allows you to create a directory on the user home directory   private static void createDirectory final String directoryName        final File homeDirectory   new File System getProperty  user home         final File newDirectory   new File homeDirectory  directoryName       if  newDirectory exists              boolean result   newDirectory mkdir             if result                System out println  The directory is created                      else           System out println  The directory already exist

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new File   path directory   mkdirs      Here  directory  is the name of the directory you want to create exist

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You can try FileUtils forceMkdir  FileUtils forceMkdir   path directory      This library have a lot of useful functions

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Well to create Directory folder in java we have two methods  Here makedirectory method creates single directory if it does not exist   File dir   new File  path name    boolean isCreated   dir mkdir      And  File dir   new File  path name    boolean isCreated   dir mkdirs      Here makedirectories method will create all directories that are missing in the path which the file object represent   For example refer link below  explained very well   Hope it helps   https   www flowerbrackets com create-directory-java-program

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After  7 year  I will update it to better approach which is suggested by Bozho  File theDir   new File  quot  path directory quot    if   theDir exists         theDir mkdirs

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public class Test1       public static void main String   args               String path   System getProperty  user home           File dir new File path   new folder           if dir exists                System out println  A folder with name  new folder  is already exist in the path   path           else             dir mkdir

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if you want to be sure its created then this   final String path    target logs    final File logsDir   new File path   final boolean logsDirCreated   logsDir mkdir    if   logsDirCreated        final boolean logsDirExists   logsDir exists        assertThat logsDirExists  isTrue        beacuse mkDir   returns a boolean  and findbugs will cry for it if you dont use the variable  Also its not nice     mkDir   returns only true if mkDir   creates it  If the dir exists  it returns false  so to verify the dir you created  only call exists   if mkDir   return false   assertThat   will checks the result and fails if exists   returns false  ofc you can use other things to handle the uncreated directory

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The following method should do what you want  just make sure you are checking the return value of mkdir     mkdirs    private void createUserDir final String dirName  throws IOException       final File homeDir   new File System getProperty  user home         final File dir   new File homeDir  dirName       if   dir exists    amp  amp   dir mkdirs              throw new IOException  Unable to create     dir getAbsolutePath

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Just wanted to point out to everyone calling File mkdir   or File mkdirs   to be careful the File object is a directory and not a file   For example if you call mkdirs   for the path  dir1 dir2 file txt  it will create a folder with the name file txt which is probably not what you wanted   If you are creating a new file and also want to automatically create parent folders you can do something like this               File file   new File filePath               if  file getParentFile      null                    file getParentFile   mkdirs

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Create a single directory   new File  C   Directory1   mkdir     Create a directory named    Directory2 and all its sub-directories    Sub2  and    Sub-Sub2  together   new File  C   Directory2  Sub2  Sub-Sub2   mkdirs      Source  this perfect tutorial   you find also an example of use

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This the way work for me do one single directory or more or them  need to import java io File    enter the code below to add a diectory dir1 or check if exist dir1  if does not  so create it and same with dir2 and dir3         File filed   new File  C   dir1        if  filed exists      if filed mkdir     System out println  directory is created       else  System out println  directory exist            File filel   new File  C   dir1  dir2        if  filel exists      if filel mkdir     System out println  directory is created         else  System out println  directory exist            File filet   new File  C   dir1  dir2  dir3        if  filet exists      if filet mkdir     System out println  directory is  created        else  System out println  directory exist

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mkdir vs mkdirs    If you want to create a single directory use mkdir  new File   path directory   mkdir      If you want to create a hierarchy of folder structure use mkdirs   new File   path directory   mkdirs

[java] How to create a directory in Java?

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