package com.example;

import java.io.*;

import java.util.Arrays;

import java.util.regex.Pattern;

public class DirList {

/**

* @param args

*/

public static void main(final String[] args) {

// TODO Auto-generated method stub

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);

//使用匿名内部类实现 args要加上final

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();

}

});

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();

}

}