My best shot came up short

Question about the task

Resolved

I think I met all the requirements but obviously am misinterpreting something. Tried debugging with cmd line input of single space between arguments and the 8 30 8 4 format and both add a line to the file that looks ok to me but the verification is none to happy.

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

The program is started with the following arguments:
-c productName price quantity

Argument values:
where id is 8 characters.
productName is 30 characters.
price is 8 characters.
quantity is 4 characters.
-c adds the product with the specified parameters to the end of the file, and generates an id by incrementing the maximum id found in the file.

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.

Before adding a new line, re-write all of its contents to the file.

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.
The Solution class should not use static variables.
When you run the program without arguments, the product list must remain unchanged.
When the program is run with the arguments "-c productName price quantity", a new line with the corresponding product should be added to the end of the file.
The product must have the next id after the maximum id found in the file.
The format of the new product line must precisely match that format specified in the task.
The file streams must be closed.

package com.codegym.task.task18.task1827; /* Prices */ import java.io.*; import java.util.*; public class Solution { public static void main(String[] args) { try { if (args.length == 0) return; BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String fileName = br.readLine(); FileReader fr = new FileReader(fileName); BufferedReader brFile = new BufferedReader(fr); Map<Integer, String> map = new TreeMap<>(); String line = null; int id = 0; while ((line = brFile.readLine()) != null) { id = Integer.parseInt(line.substring(0, 8).trim()); map.put(id, line); } if (args[0].equals("-c")) { id++; Vector<String> vector = new Vector(); vector.addAll(Arrays.asList(args)); vector.remove(0); // -c action Double price = Double.valueOf(vector.remove(vector.size()-1)); int quantity = Integer.valueOf(vector.remove(vector.size()-1)); String[] strings = vector.toArray(new String[vector.size()]); String productName = String.join(" ", strings); String create = String.format("%-8d%-30s%-8.2f%-4d", id, productName, price, quantity); map.put(id, create); } int i = 0; FileOutputStream fos = new FileOutputStream(fileName); for (Map.Entry<Integer, String> m : map.entrySet()) { fos.write((String.format("%s%n", m.getValue())).getBytes()); } br.close(); fr.close(); fos.close(); brFile.close(); } catch(Exception e) { System.out.println(e); } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

1 February 2019, 16:55

This was another one of my "fun" tasks. I'll message you my solve so you can compare and figure out what the verification system is complaining about with yours.

jim smith

Level 22 , Cedar Park, United States

1 February 2019, 17:20

Thanks I will take a look at that. I have figured out to limit my wall head bashing figuring out the nuances of formatting before just asking for help now.

Jesús de Llera

Level 23 , Badajoz, Spain

23 June 2019, 15:17

Same issue here. When I run the code on terminal everything looks ok. Could you share your solution?? Thanks! This is my code, by the way;

package com.codegym.task.task18.task1827;

/*
Prices

*/

import java.io.*;
import java.util.ArrayList;

public class Solution {
    public static void main(String[] args) throws Exception {

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String fileName = reader.readLine();

        if (args.length > 0) {

            if (args[0].equals("-c")) {
                addLine(fileName, args);
            }

        }

        reader.close();
    }

    public static void addLine(String fileName, String[] args) throws IOException {

        BufferedReader inputStream = new BufferedReader(new InputStreamReader(new FileInputStream(new File(fileName))));

        ArrayList<String> text = new ArrayList<>();

        while (inputStream.ready()) {

            text.add(inputStream.readLine());

        }

        int lastLineId = Integer.parseInt(text.get(text.size() - 1).substring(0, 8).trim()) + 1;

        String productName = args[1];
        String price = args[2];
        String quantity = args[3];

        if (productName.length() > 30) productName = productName.substring(0, 30);
        if (price.length() > 8) price = price.substring(0, 8);
        if (quantity.length() > 4) quantity = quantity.substring(0, 4);

        String lastLine = String.format("%-8s%-30s%-8s%-4s", Integer.toString(lastLineId), productName, price, quantity);

        FileWriter fileWriter = new FileWriter(fileName);

        for (int i = 0; i < text.size(); i++) {

            fileWriter.write(text.get(i) + "\n");

        }

        fileWriter.write(lastLine);

        inputStream.close();

        fileWriter.close();

    }
}