java list files in directory

1List<String> results = new ArrayList<String>();
2
3
4File[] files = new File("/path/to/the/directory").listFiles();
5//If this pathname does not denote a directory, then listFiles() returns null. 
6
7for (File file : files) {
8    if (file.isFile()) {
9        results.add(file.getName());
10    }
11}

1public class Pathnames {
2
3    public static void main(String[] args) {
4        // Creates an array in which we will store the names of files and directories
5        String[] pathnames;
6
7        // Creates a new File instance by converting the given pathname string
8        // into an abstract pathname
9        File f = new File("D:/Programming");
10
11        // Populates the array with names of files and directories
12        pathnames = f.list();
13
14        // For each pathname in the pathnames array
15        for (String pathname : pathnames) {
16            // Print the names of files and directories
17            System.out.println(pathname);
18        }
19    }
20}
21

1	public static List<String> mapFolder(String path, boolean includeEmptyFolders) {
2    	List<String> map = new ArrayList<String>();
3    	List<String> unmappedDirs = new ArrayList<String>();
4    	File[] items = new File(path).listFiles();
5
6    	if (!path.substring(path.length() - 1).equals("/")) {
7    		path += "/";
8    	}
9    		
10    	if (items != null) {
11	    	for (File item : items) {
12	    		if (item.isFile())
13	    				map.add(path+item.getName());
14	    		else
15	    			unmappedDirs.add(path+item.getName());
16	    	}
17	    	
18	    	if (!unmappedDirs.isEmpty()) {
19	    		for (String folder : unmappedDirs) {
20	    			List<String> temp = mapFolder(folder, includeEmptyFolders);
21	    			if (!temp.isEmpty()) {
22	    				for (String item : temp)
23	    					map.add(item);
24    				} else if (includeEmptyFolders == true)
25    					map.add(folder+"/");
26	    		}
27	    	}
28    	}
29    	return map;
30    }

1File f = new File("D:/Programming");
2
3// This filter will only include files ending with .py
4FilenameFilter filter = new FilenameFilter() {
5        @Override
6        public boolean accept(File f, String name) {
7            return name.endsWith(".py");
8        }
9    };
10
11// This is how to apply the filter
12String [] pathnames = f.list(filter);
13