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问问各位大佬，使用了fiilewrite，为什么写入不到文件里呢

import java.io.BufferedReader;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.util.Scanner;

public class chu {

public static void main(String[] args) {

StringBuffer sb = new StringBuffer();

System.out.println("*****京津冀火车车次查询*****");

System.out.print("请输入您的出行日期(按照 xxxx-xx-xx的格式，如：2018-06-01)：");

Scanner in=new Scanner(System.in);

String date=in.nextLine();

System.out.println("-----车站电报码提示：北京BJP 天津TJP 石家庄SJP-----");

System.out.println("请输入出发地点(请输入车站电报码)：");

String set=in.nextLine();

System.out.println("请输入目的地点(请输入车站电报码)：");

String end=in.nextLine();

System.out.println("车次\t出发站\t目的站\t出发时间\t到达时间");

try {

URL url = new URL("https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date="+date+"&leftTicketDTO.from_station="+set+"&leftTicketDTO.to_station="+end+"&purpose_codes=ADULT");

URLConnection urlCon = url.openConnection();

InputStream get = urlCon.getInputStream();

BufferedReader buf = new BufferedReader(new InputStreamReader(get, "utf-8"));

String str="";

while((str=buf.readLine())!=null) {

sb.append(str);

}

String yang = sb.toString();

int n=sb.indexOf("预订")+16;

String yun = yang.substring(n);

String [] getStr = yun.split("\\|");

//System.out.println(getStr.length);

File f=new File("D:\\HELLO.txt");//新建一个文件对象

FileWriter fw;

fw=new FileWriter(f);

int b = 0;//用来显示一行放多少

outer:for (int i = 0; i < getStr.length; i++) {

if(b==4) {

i+=10;

b=0;

System.out.println();

fw.write("\n");

continue outer;

}

if(b==0) {

System.out.print(getStr[i]+"\t");

fw.write(getStr[i]+" ");

i+=3;

}

System.out.print(getStr[i]+"\t");

fw.write(getStr[i]+" ");

b++;

}

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}