为什么我的demo下面没有创建出来文件

package com.imooc.rd;

import java.io.File;

import java.io.IOException;

import java.io.RandomAccessFile;

public class RafDemo {

public static void main(String[] args) throws IOException{

File demo=new File("demo");

if(!demo.exists()){

demo.mkdirs();

File file=new File(demo,"raf.dat");

if(!file.exists()){

file.createNewFile();

RandomAccessFile raf=new RandomAccessFile(file,"rw");

raf.write('A');

System.out.println(raf.getFilePointer());

}

}

}

}