Java递归 遍历目录的小例子

public static void main(string[] args) {

         file f = new file("d:\\test\\fsd");
         listchids(f,0);

     }

     public static void listchids(file f,int level){

         string presrt = "";
         for(int i=0;i<level;i++){

             presrt += "----";
         }

         system.out.println(presrt+f.getname());

         if(!f.isdirectory()){

             return ;
         }else{

             file[] fs = f.listfiles();
             for(int i=0;i<fs.length;i++){

                 listchids(fs[i], level+1);
             }
         }
     }