What am I doing wrong?

Question about the task

Building a file

Java Core, Level 8, Lesson 11

Resolved

I can't pass any test...

Let's build a file from various pieces.
Read file names from the console.
Each file has a name: <someName>.partN.

For example, Lion.avi.part1, Lion.avi.part2, ..., Lion.avi.part37.

The file names are supplied in random order. The word "end" is used to stop reading in file names.
In the folder where all the files are located, create a file without the "part" suffix, i.e. without ".<partN>".

For example, Lion.avi.

Use a buffer to copy all the bytes from the partial files to the created file.
Copy the first in the proper order, first the first part, then the second, ..., finally - the last part.
Close the streams.

Requirements:

The program must read file names from the console until the word "end" is entered.
Create a stream to write to the file without the "part" suffix (".<partN>") in the folder with all the "part" files.
Copy all the bytes from the *.partN files to the new file.
You should use a buffer for the reading and writing.
The file streams must be closed.
Don't use static variables.

package com.codegym.task.task18.task1825; import java.io.*; import java.util.*; /* Building a file */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader console = new BufferedReader(new InputStreamReader(System.in)); Map<Integer, String> parts = new HashMap<>(); String name, shortName = ""; while (!(name = console.readLine()).equals("end")) { int endpoint = name.indexOf(".part"); int index = Integer.parseInt(name.substring(endpoint + 5, name.length() - 1)); parts.put(index, name); if (shortName.isEmpty()) { shortName = name.substring(0, index); } } console.close(); if (!parts.isEmpty()) { FileOutputStream fileOutputStream = new FileOutputStream(shortName); for (int index = 1; index < parts.size() + 1; index ++) { FileInputStream fileInputStream = new FileInputStream(parts.get(index)); byte[] buffer = new byte[fileInputStream.available()]; fileInputStream.read(buffer); fileInputStream.close(); fileOutputStream.write(buffer); } fileOutputStream.close(); } } }

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Dyrits

Level 22

10 October 2020, 16:00

solution

I just had to fix line 20:

if (shortName.isEmpty()) { shortName = name.substring(0, endpoint); }

This is the final code. I changed the names of variables...

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
        Map<Integer, String> parts = new HashMap<>();
        String inputFileName, outputFileName = "";
        while (!(inputFileName = console.readLine()).equals("end")) {
            int endpointIndex = inputFileName.indexOf(".part");
            int partNumber = Integer.parseInt(inputFileName.substring(endpointIndex + 5));
            parts.put(partNumber, inputFileName);
            if (outputFileName.isEmpty()) { outputFileName = inputFileName.substring(0, endpointIndex); }
        }
        console.close();
        if (!parts.isEmpty()) {
            FileOutputStream fileOutputStream = new FileOutputStream(outputFileName);
            for (int index = 1; index < parts.size() + 1; index ++) {
                FileInputStream fileInputStream = new FileInputStream(parts.get(index));
                byte[] buffer = new byte[fileInputStream.available()];
                fileInputStream.read(buffer);
                fileInputStream.close();
                fileOutputStream.write(buffer);
            }
            fileOutputStream.close();
        }
    }
}