package io;

import java.io.*;

import java.util.*;

import java.util.regex.*;

/**

* RUN:

* javac io/DirList.java && java io.DirList

*

* OUTPUT:

*

*/

public class DirList {

public static void main(String[] args) {

File path = new File(".");

String[] list;

if (args.length == 0) {

list = path.list();

}

else {

list = path.list(new DirFilter(args[0]));

}

// System.out.println(Arrays.toString(list));

Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);

for (String dirItem : list) {

System.out.println(dirItem);

}

}

}

class DirFilter implements FilenameFilter {

private Pattern pattern;

public DirFilter(String regexp) {

pattern = Pattern.compile(regexp);

}

public boolean accept(File dir, String name) {

return pattern.matcher(name).matches();

}

}