I can't figure out the problem.

Question about the task

Resolved

I've been at it for hours. It's probably something small and I'm crosseyed and can no longer see it. Or of course it's major and I have to redo the whole thing. Again. Help please?

CrUD for a table inside a file
Read a file name for CrUD operations from the console

The program runs with one of the following sets of arguments:
-u id productName price quantity
-d id

Argument values:
where id is 8 characters
productName is 30 characters
price is 8 characters
quantity is 4 characters
-u updates the data for the product with the specified id
-d performs the physical deletion of the product with the specified id (all data related to the passed id)

The file data is stored in the following order (without separating spaces):
id productName price quantity
Each data field is padded with spaces up to its length

Example:
19847 Swim trunks, blue 159.00 12 198479 Swim trunks, black with printe173.00 17 19847983Snowboard jacket with reflecti10173.991234

Requirements:

The program should read a file name for CrUD operations from the console.
When you run the program without arguments, the product list must remain unchanged.
When the program is started with the arguments "-u id productName price quantity", the product information in the file should be updated.
When the program is started with the arguments "-d id", the line for the product with the specified id should be removed from the file.
The file streams must be closed.

package com.codegym.task.task18.task1828; /* Prices 2 */ import java.io.*; import java.util.Iterator; import java.util.Map; import java.util.TreeMap; public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String fileName = reader.readLine(); reader.close(); TreeMap<String, String> map = new TreeMap<>(); BufferedReader fileReader = new BufferedReader(new FileReader(fileName)); while (true) { String data = fileReader.readLine(); if(data == null) { break; } else { String id = data.substring(0,8); String remainder = data.substring(9); map.put(id, remainder); } } fileReader.close(); if (args.length == 0) { return; } if (args[0].equals("-u")){ String id = args[1]; String productName = args[2]; String price = args[3]; String quantity = args[4]; while (id.length() < 8) { id += " "; } while (productName.length() < 30) { productName += " "; } while (price.length() < 8) { price += " "; } while (quantity.length() < 4) { quantity += " "; } Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, String> pair = iterator.next(); String key = pair.getKey().trim(); if(key.equals(args[1])) { pair.setValue(productName + price + quantity); } } FileOutputStream uFileOutput = new FileOutputStream(fileName); for (Map.Entry<String, String> update : map.entrySet()) { uFileOutput.write((update.getKey() + update.getValue()).getBytes()); } uFileOutput.close(); } if(args[0].equals("-d")) { Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, String> pair = iterator.next(); String key = pair.getKey().trim(); if (key.equals(args[1])) { map.remove(pair); } } FileOutputStream dFileOutput = new FileOutputStream(fileName); for (Map.Entry<String, String> update : map.entrySet()) { dFileOutput.write((update.getKey() + update.getValue()).getBytes()); } dFileOutput.close(); } } }