Listing file system from root directory

[Java Tip]

The code below demonstrates how to list the file system root directories.

private static void doListRoots() {

        File[] roots = File.listRoots();

        for (int i=0; i<roots.length; i++) {
            System.out.println("Root[" + i + "] = " + roots[i]);
        }
    }

[smerchant]

We can also use the following code to get all the subdirectories and files with any given folder.

public class DirectoryReader {

public static void populateArrayListsWithDirAndFilesInFolders(String currDirectory, ArrayList<String> directories, ArrayList<String> files )
{
File folder = new File(currDirectory);
File[] listOfFiles = folder.listFiles();

for (int i = 0; i < listOfFiles.length; i++)
{
if(listOfFiles[i].isFile())
{
files.add(listOfFiles[i].getPath());
}
if (listOfFiles[i].isDirectory())
{
directories.add(listOfFiles[i].getPath());
//System.out.println("Directory name-" + listOfFiles[i].getName() + " path-" + listOfFiles[i].getPath());
}
}//End of for
}//End of populateArrayListWithDirInFolders

public static void getAllSubdirectoriesAndFiles(String basedir)
{
ArrayList<String> directories = new ArrayList<String>();
ArrayList<String> files = new ArrayList<String>();
directories.add(basedir);
int currentLocationInArrayList = 1;
while(currentLocationInArrayList<=directories.size ())
{
String currDirectory = directories.get(currentLocationInArrayList-1);
currentLocationInArrayList++;
populateArrayListsWithDirAndFilesInFolders(currDir ectory, directories, files );

}//End of while

System.out.println("*****\nFollowing are the files under the directory-" + basedir + "\n*****\n");
for(String file : files)
System.out.println(file);

System.out.println("*****\nFollowing are the subdirectories under the directory-" + basedir + "\n*****\n");
for(String directory : directories)
System.out.println(directory);

}//End of getAllSubdiectories

public static void main(String args[])
{
getAllSubdirectoriesAndFiles("E://workspace//working//");

}//End of main

} //End of directoryReader