package net.csdn.johnhuster;
import java.io.File;
import java.io.FilenameFilter;
public class FileNameFilterDemo {
 //內部類
 public class FileFilter implements FilenameFilter 
 {
  private String filterRule;
   public FileFilter(String filter)
   {
    this.filterRule = filter;
   }
   @Override
   public boolean accept(File dir, String name) {
    if(name.lastIndexOf('.')>0)
    {
      // get last index for '.' char
      int lastIndex = name.lastIndexOf('.');
     // get extension
     String str = name.substring(lastIndex);
      // match path name extension
      if(str.equals(this.filterRule))
      {
      return true;
      }
     }
     return false;
}
public static void main(String[] args)
{
File f = null; 
File[] paths; 
FileNameFilterDemo fileFilter = new FileNameFilterDemo(); 
try{ 
// create new file 
f = new File("d:\\fileList"); 
// 文件文件名字過濾器 
FilenameFilter fileNameFilter = fileFilter .new FileFilter(".txt") ; 
// returns pathnames for files and directory 
paths = f.listFiles(fileNameFilter); 
// for each pathname in pathname array 
for(File path:paths){ 
// prints file and directory paths 
System.out.println(path); 
} 
}catch(Exception e)
{ 
// if any error occurs 
e.printStackTrace(); 
} 
}
}