Listing a File System's Root Directories?

Question

I found a link http://docs.oracle.com/javase/tutorial/essential/io/dirs.html with a example:

    Iterable<Path> dirs = FileSystems.getDefault().getRootDirectories();
    for (Path name: dirs) {
        System.err.println(name);
    }

Can you help me figure out what I need to do if I want to list a file from "C://" with the above code?

http://stackoverflow.com/questions/2056221/recursively-list-files-in-java — ihsan kocak, Aug 09 '13 at 15:42

d0x · Answer 1 · 2013-08-09T15:54:00.190

0

With plain Java NIO:

public static void main(final String[] args)
{
    // This will give u all Root Directories. Like: C:, D:, ...
    final Iterable<Path> rootDirs = FileSystems.getDefault().getRootDirectories();

    for (final Path rootDir : rootDirs)
    {
        if (rootDir.startsWith("C:") == false)
            continue;

        // This will loop through every of this root directories
        try (DirectoryStream<Path> stream = Files.newDirectoryStream(rootDir))
        {
            for (final Path file : stream)
            {
                System.out.println(file.getFileName());
            }
        }
        catch (IOException | DirectoryIteratorException x)
        {
            System.err.println(x);
        }
    }

}

edited Aug 09 '13 at 15:54

answered Aug 09 '13 at 15:43

d0x

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It will print all the files in all the root folders such as C:\ , d:\, e:\. Put a check for just c drive as question is for that. – Juned Ahsan Aug 09 '13 at 15:45
Yes, that is what you asked, or? – d0x Aug 09 '13 at 15:45
1

I am not the questioner, he/she is asking for "Can you help me how to use it ? if i want to list a file from "C://" with code above" – Juned Ahsan Aug 09 '13 at 15:46
I believe, your code will not compile. rootDir is not a string object and hence you cannot do this (rootDir.startsWith("C:") == false) – Juned Ahsan Aug 09 '13 at 15:48
NIO Magic :), See: http://docs.oracle.com/javase/7/docs/api/java/nio/file/Path.html#startsWith(java.nio.file.Path) – d0x Aug 09 '13 at 15:49

score 0 · Answer 2 · answered Aug 09 '13 at 15:47

try this

 Iterable<Path> dirs = FileSystems.getDefault().getRootDirectories();
 for (Path name: dirs) {
     System.err.println(name);
    if("C:\\".equalsIgnoreCase(name.toString())){
        File dir = new File(name.toString());
        for(File file : dir.listFiles())
            System.out.println(file.getName());

    }
  }
 }

score 0 · Answer 3 · edited Jun 14 '18 at 13:15

0

starting java1.7 root directories can be listed using

Iterable<Path> dirs = FileSystems.getDefault().getRootDirectories();

edited Jun 14 '18 at 13:15

Robert

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answered Jun 14 '18 at 12:55

sevvalai

99
2

Brinnis · Answer 4 · 2013-08-09T15:53:09.113

-1

I perfer just using the File class.

    File[] dirs = File.listRoots();
    for (File name: dirs) {
        if (name.toString().equals("C:\\")){
            String[] cDirs = name.list();
            for (String cDir: cDirs) {
                System.out.println(cDir);
            }
        }
    }

This code with also work in older java versions that Java 1.7; which is the minimum version in order to use FileSystems.

edited Aug 09 '13 at 15:53

answered Aug 09 '13 at 15:46

Brinnis

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5
12

2

You really don't need to create a File object for comparison. Simply do this: name.toString.equals("C:\\")) – Juned Ahsan Aug 09 '13 at 15:47

Listing a File System's Root Directories?

4 Answers4