How to get current working directory in Java

Question

Let s say I have my main class in C  Users Justian Documents   How can I get my program to show that it s in C  Users Justian Documents   Hard-Coding is not an option- it needs to be adaptable if it s moved to another location   I want to dump a bunch of CSV files in a folder  have the program recognize all the files  then load the data and manipulate them  I really just want to know how to navigate to that folder

User · Answer

I just used   import java nio file Path  import java nio file Paths         Path workingDirectory Paths get      toAbsolutePath

User · Answer

If you want the absolute path of the current source code  my suggestion is   String internalPath   this getClass   getName   replace      File separator   String externalPath   System getProperty  user dir   File separator  src   String workDir   externalPath File separator internalPath substring 0  internalPath lastIndexOf File separator

User · Answer

Who says your main class is in a file on a local harddisk  Classes are more often bundled inside JAR files  and sometimes loaded over the network or even generated on the fly   So what is it that you actually want to do  There is probably a way to do it that does not make assumptions about where classes come from

User · Answer

One way would be to use the system property System getProperty  user dir    this will give you  The current working directory when the properties were initialized   This is probably what you want  to find out where the java command was issued  in your case in the directory with the files to process  even though the actual  jar file might reside somewhere else on the machine  Having the directory of the actual  jar file isn t that useful in most cases   The following will print out the current directory from where the command was invoked regardless where the  class or  jar file the  class file is in   public class Test       public static void main final String   args                final String dir   System getProperty  user dir            System out println  current dir       dir               if you are in  User me  and your  jar file containing the above code is in  opt some nested dir  the command java -jar  opt some nested dir test jar Test will output current dir    User me   You should also as a bonus look at using a good object oriented command line argument parser  I highly recommend JSAP  the Java Simple Argument Parser  This would let you use System getProperty  user dir   and alternatively pass in something else to over-ride the behavior  A much more maintainable solution  This would make passing in the directory to process very easy to do  and be able to fall back on user dir if nothing was passed in

User · Answer

If you want to get your current working directory then use the following line  System out println new File     getAbsolutePath

User · Answer

Use CodeSource getLocation    This works fine in JAR files as well  You can obtain CodeSource by ProtectionDomain getCodeSource   and the ProtectionDomain in turn can be obtained by Class getProtectionDomain     public class Test       public static void main String    args  throws Exception           URL location   Test class getProtectionDomain   getCodeSource   getLocation            System out println location getFile                 Update as per the comment of the OP       I want to dump a bunch of CSV files in a folder  have the program recognize all the files  then load the data and manipulate them  I really just want to know how to navigate to that folder    That would require hardcoding knowing their relative path in your program  Rather consider adding its path to the classpath so that you can use ClassLoader getResource    File classpathRoot   new File classLoader getResource     getPath     File   csvFiles   classpathRoot listFiles new FilenameFilter          Override public boolean accept File dir  String name            return name endsWith   csv                Or to pass its path as main   argument

User · Answer

File currentDirectory   new File new File      getAbsolutePath     System out println currentDirectory getCanonicalPath     System out println currentDirectory getAbsolutePath       Prints something like    path to current directory  path to current directory     Note that File getCanonicalPath   throws a checked IOException but it will remove things like

User · Answer

this getClass   getClassLoader   getResource     getPath

[java] How to get current working directory in Java?

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