Why does my code not pass?

Question about the task

Resolved

Seriously I have no idea why this code is not passing. I use FileReader for reading a file's contents and also I close the FileReader stream using try-with-resources. Does anybody have any idea why it's not passing?

1. Read a file name from the console. Read the contents of the file.
2. For each line in the file:
2.1. reverse the order of all characters.
2.2. display the result.
3. Close the streams.

Example input file:
I'm a programmer. Amigo

Example result:
.remmargorp a m'I ogimA

Requirements:

The program must read the file name from the console (use BufferedReader).
The BufferedReader used for reading input from the console must be closed after use.
The program must read the file's contents (use FileReader).
The file input stream (FileReader) must be closed.
The program should display all of the characters from the file in reverse order.

package com.codegym.task.task19.task1926; /* Mirror image */ import java.io.*; public class Solution { public static void main(String[] args) throws IOException { String fileName; BufferedReader readerS = new BufferedReader(new InputStreamReader(System.in)); fileName = readerS.readLine(); readerS.close(); File file = new File(fileName); FileReader fileReader = new FileReader(file); BufferedReader reader = new BufferedReader(fileReader); reader.lines() .map(StringBuilder::new) .map(StringBuilder::reverse) .forEach(System.out::println); fileReader.close(); reader.close(); } }

Comments (5)

Popular
New
Old

You must be signed in to leave a comment

Arek Zieliński (abLe) Software Engineer

28 April 2022, 07:40

solution

I found the problem, I did also as you all said, but still, it was failing a verification. The problem was with the initialization of FileReader. It's a little bit ridiculous, but I used the name of the file instead of the object File in initialization and the problem was solved so. Before:

String fileName;
BufferedReader readerS = new BufferedReader(new InputStreamReader(System.in));

fileName = readerS.readLine();
readerS.close();

File file = new File(fileName);
FileReader fileReader = new FileReader(file);

After:

String fileName;
BufferedReader readerS = new BufferedReader(new InputStreamReader(System.in));

fileName = readerS.readLine();
readerS.close();

FileReader fileReader = new FileReader(fileName);

Still, your help directed me to the solution. Thanks 🙂

Lisa L

Level 47 , Nuremberg, Germany

28 April 2022, 08:39

woahhhh, cool, a fat plus from me for you ;) They are looking for the FileReader constructor taking a string parameter. This, my second account is at core lvl7 now (but shows 23 cause of premium pros 16 syntax level). So I probably can start the in-outputstream tasks tomorrow again. Your info is really appreciated.

Lisa L

Level 47 , Nuremberg, Germany

28 April 2022, 06:26

useful

I think validation not only looks for the wording FileReader but also for read or readLine in the code. I gave up on testing if just the existance of those words will make it validate and instead have written a helper method that I used for a lot of those tasks. It simulates Files.readAllLines(), uses a FileReader and returns a list of Strings. From that list I was able to stream and that usually worked.

LuisRC

Level 39 , Gijón, Spain

28 April 2022, 04:52

useful

I agree with the comment of @Justin. This task is just to read the file by using a while(reader.ready) and then just iterate in reverse order the result and print it.

Justin Smith

Level 41 , Greenfield, USA, United States

27 April 2022, 23:11

useful

Lines 24-26 are like nothing I've seen before, you didn't learn that from CodeGym. 😅 Why not just iterate through the file with a while(reader.ready()), then use readLine for each line? Then just do the work on each String object to reverse it and print it.