dis_file.java

刘艺编著的java教程的课本习题加例题代码 很有用哦！

import java.io.*;
class ListFilter implements FilenameFilter{
 private String pre="",ext="";
 public ListFilter(String filterstr){
  int i,j;
  filterstr=filterstr.toLowerCase();
  i=filterstr.indexOf("*");
  j=filterstr.indexOf(".");
  if(i>0)
   pre=filterstr.substring(0,i);
  else if(i==-1)
        if(j>0)
         pre=filterstr.substring(0,j-1);
  if(j>=0)
   ext=filterstr.substring(j+1);

 } 
 public boolean accept(File dir,String filename){
   boolean y=true;
   try{
    filename=filename.toLowerCase();
    y=filename.startsWith(pre)&filename.endsWith(ext);
   }
   catch(NullPointerException e){}
   return y;
 }
}
public class Dis_File{
 public static void main(String args[]){
  File f=new File("c:\\windows");
  ListFilter ls=new ListFilter("bl*.bmp");
  System.out.println(f.getAbsolutePath());
  String str[]=f.list(ls);
  for(int i=0;i<str.length;i++)
   System.out.println(str[i]);
 }
}