java IO 目录列表器

package cn.io;


import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;


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]));
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 regex){
pattern =Pattern.compile(regex);
}
public boolean accept(File dir,String name){
return pattern.matcher(name).matches();
}
}