package  untitled2;

 import  java.io.*;

 public   class  Filter {

   public   static   void  main(String[] args) {
    File v_Dir =  new  File("C:/");
    String [] v_list = v_Dir.list( new  ExtFilter("zip"));
     for  ( int  i= 0 ; i < v_list.length; i++)
      System.out.println(v_list[i]);
  }
}

 class  ExtFilter  implements  FilenameFilter {
  
  String ext;
  
  ExtFilter(String ext) {
     this .ext = "." + ext;
  }
  
   public   boolean  accept (File dir, String name) {
     return  name.endsWith(ext);
  }
}

String [] v_list = v_Dir.list( new  ExtFilter("ZIP"));

accept (File dir, String name) { return  name.toLowerCase().endsWith(ext);  }