//: io/DirList3.java
// Building the anonymous inner class "in-place."
// {Args: "D.*\.java"}
import java.util.regex.*;
import java.io.*;
import java.util.*;

public class DirList3 {
  public static void main(final String[] args) {
    File path = new File(".");
    String[] list;
    if(args.length == 0)
      list = path.list();
    else
      list = path.list(new FilenameFilter() {
        private Pattern pattern = Pattern.compile(args[0]);
        public boolean accept(File dir, String name) {
          return pattern.matcher(name).matches();
        }
      });
    Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
    for(String dirItem : list)
      System.out.println(dirItem);
  }
} /* Output:
DirectoryDemo.java
DirList.java
DirList2.java
DirList3.java
*///:~