import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;
public class MainClass {
public static FilenameFilter filter(final String regex) {
// Creation of anonymous inner class:
return new FilenameFilter() {
private Pattern pattern = Pattern.compile(regex);
public boolean accept(File dir, String name) {
return pattern.matcher(new File(name).getName()).matches();
}
}; // End of anonymous inner class
}
public static void main(String[] args) {
File path = new File(".");
String[] list;
if (args.length == 0)
list = path.list();
else
list = path.list(filter(args[0]));
Arrays.sort(list);
for (int i = 0; i < list.length; i++)
System.out.println(list[i]);
}
}