FilenameFilter文件过滤

import java.io.File;
import java.io.FilenameFilter;

public class ImageFilter  implements FilenameFilter{       
      
  public boolean isGif(String file) {       
    if (file.toLowerCase().endsWith(".gif")){       
      return true;       
     }else{       
      return false;       
     }       
   }       
  public boolean isJpg(String file){       
    if (file.toLowerCase().endsWith(".ff")){       
      return true;       
     }else{       
      return false;       
     }       
   }       
      
  public boolean isPng(String file){       
    if (file.toLowerCase().endsWith(".png")){       
      return true;       
     }else{       
      return false;       
     }       
   }       
  public boolean accept(File dir,String fname){       
    return (isGif(fname) || isJpg(fname) || isPng(fname));  
      
   }
 
  public static void main(String[] args){     
       File directory=new File("d:/bak");  
       String[] images=null;
       if (null != directory&&directory.isDirectory()&&directory.canRead()){
       images= directory.list(new ImageFilter());
           if (null!=images){
        int len=images.length;
        for(int i =0;i<len;i++){
        System.out.println("the search filename :"+images[i]);
        }
           }
       }else{
       System.out.println("做日志[不存在该目录]....");
       }
  }     
}