循环找文件

package com.photo.text;

import java.io.*;

public class Readphoto
{

public static void main(String[] args) {

File file = new File("group");
long m=System.currentTimeMillis();
getPhoto(file);
System.out.println(System.currentTimeMillis()-m);
}

public static void getPhoto(File f){
if(f.isFile())
System.out.println(f.getName());
else{
File f1[]=f.listFiles();
for(int i=0;i<f1.length;i++){
if(f1[i].isDirectory())
getPhoto(f1[i]);
else
System.out.println(f1[i].getName());
}
}

}

}