递归 查找 一个文件夹所有的子文件夹和文件

Java代码  

import java.io.*;

 public class RecursionTest{
     public static void main(String[] args){
         String fullFileName = "c:/A";
         File f = new File(fullFileName);
        p(f.getName());
         int count = 1;
        readFile(f, count);
    }

     private static void readFile(File f, int count){
         String pre = "";
         for(int i=0; i<count; i++){
             pre+="    ";
        }


         if(f.exists()){
            File[] fs = f.listFiles();
             for(int i=0; i<fs.length; i++){
                p(pre + fs[i].getName());
                 if(fs[i].isDirectory()){
                     readFile(fs[i], count + 1);
                 }else if(fs[i].isFile()){
                }
            }
         }else{
             p("不存在");
        }
    }

     private static void p(Object o){
        System.out.println(o.toString());
    }
}