import java.io.*;
public class DirFilter implements FilenameFilter
{
    private String prefix="",suffix="";            //文件名的前綴、后綴
    public DirFilter(String filterstr)
    {
        filterstr = filterstr.toLowerCase();
        int i = filterstr.indexOf('*');
        int j = filterstr.indexOf('.');
        if (i>0)
            prefix = filterstr.substring(0,i);
        if (j>0)
            suffix = filterstr.substring(j+1);
    }
    public static void main(String args[])
    {                                  //創(chuàng)建帶通配符的文件名過濾器對象
        FilenameFilter filter = new DirFilter("w*abc.txt");
        File f1 = new File("");  
        File curdir = new File(f1.getAbsolutePath(),"");   //當前目錄
        System.out.println(curdir.getAbsolutePath());
        String[] str = curdir.list(filter);  //列出帶過濾器的文件名清單
        for (int i=0;i<str.length;i++)
            System.out.println("\t"+str[i]);
    }
    public boolean accept(File dir, String filename)
    {
        boolean yes = true;
        try
        {
            filename = filename.toLowerCase();
            yes = (filename.startsWith(prefix)) &
                  (filename.endsWith(suffix));
        }
        catch(NullPointerException e)
        {
        }
        return yes;
    }
}