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Question about the task

Let's make the code do something useful!

Java Syntax, Level 9, Lesson 11

Resolved

How do I handle this one?

Task: The program reads in two file names. It copies the first file to the location specified by the second file name.
New task: The program reads in two file names. It copies the first file to the location specified by the second file name.
If the specified file (to be copied) does not exist, then the program should display "File does not exist." and read a file name one more time and only then read the destination file name.

Requirements:

The program must read file names.
The main method must handle exceptions thrown by the getInputStream method. If an exception occurs, you should display "File does not exist.".
The program must copy the contents of the first file to the second one.
The main method should call the getInputStream method.
Don't change the getInputStream method.
The main method should call the getOutputStream method.
Don't change the getOutputStream method.

package com.codegym.task.task09.task0929; import java.io.*; /* Let's make the code do something useful! */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String sourceFileName = reader.readLine(); String destinationFileName = reader.readLine(); InputStream fileInputStream; OutputStream fileOutputStream; try { fileInputStream = getInputStream(sourceFileName); } catch (IOException e) { System.out.println("File does not exit."); sourceFileName = reader.readLine(); fileInputStream = getInputStream(sourceFileName); } fileOutputStream = getOutputStream(destinationFileName); while (fileInputStream.available() > 0) { int data = fileInputStream.read(); fileOutputStream.write(data); } fileInputStream.close(); fileOutputStream.close(); } public static InputStream getInputStream(String fileName) throws IOException { return new FileInputStream(fileName); } public static OutputStream getOutputStream(String fileName) throws IOException { return new FileOutputStream(fileName); } }

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Shreyas Joshi

Level 16 , Mumbai, India

24 March 2019, 07:17

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String sourceFileName = reader.readLine(); InputStream fileInputStream; try { fileInputStream = getInputStream(sourceFileName); } catch (IOException e) { System.out.println("File does not exist."); sourceFileName = reader.readLine(); fileInputStream = getInputStream(sourceFileName); } String destinationFile = reader.readLine(); OutputStream fileOutputStream = getOutputStream(destinationFile); while (fileInputStream.available() > 0) { int data = fileInputStream.read(); fileOutputStream.write(data); } fileInputStream.close(); fileOutputStream.close(); } public static InputStream getInputStream(String fileName) throws IOException { return new FileInputStream(fileName); } public static OutputStream getOutputStream(String fileName) throws IOException { return new FileOutputStream(fileName); }

Pavlo Plynko Java Developer at CodeGym

30 January 2019, 14:31

Check your phrase "File does not exist.".

Guadalupe Gagnon

Level 37 , Tampa, United States

29 January 2019, 14:07

Try moving line 15 to after line 27

Hashirama

Level 26 , Port-Harcourt, Nigeria

31 January 2019, 12:24

That would violate the first condition of the task. Also, after line 27 is, we are out of the main method.

Guadalupe Gagnon

Level 37 , Tampa, United States

31 January 2019, 14:10

solution

The specifications specifically state that you read a destination filename only after you either A) get a valid sourcefile B) after the second source filename "If the specified file (to be copied) does not exist, then the program should display "File does not exist." and read a file name one more time and only then read the destination file name." Many people fail verification because of this. Also, main goes to line 38

Hashirama

Level 26 , Port-Harcourt, Nigeria

1 February 2019, 12:05

What you said concerning the specification is right. That is: The specifications specifically state that you read a destination filename only after you either A) get a valid sourcefile B) after the second source filename "If the specified file (to be copied) does not exist, then the program should display "File does not exist." and read a file name one more time and only then read the destination file name." That's exactly what I did this time and got it. I needed to read and try for the sourceFile first, before reading for the destination file. Thanks Bro. Below is the code: public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String sourceFileName = reader.readLine(); InputStream fileInputStream; try { fileInputStream = getInputStream(sourceFileName); } catch (IOException e) { System.out.println("File does not exist."); sourceFileName = reader.readLine(); fileInputStream = getInputStream(sourceFileName); } String destinationFile = reader.readLine(); OutputStream fileOutputStream = getOutputStream(destinationFile); while (fileInputStream.available() > 0) { int data = fileInputStream.read(); fileOutputStream.write(data); } fileInputStream.close(); fileOutputStream.close(); } public static InputStream getInputStream(String fileName) throws IOException { return new FileInputStream(fileName); } public static OutputStream getOutputStream(String fileName) throws IOException { return new FileOutputStream(fileName); } }

Guadalupe Gagnon

Level 37 , Tampa, United States

1 February 2019, 14:09

I had a hard time with this problem the first time I solved it because the task requirements start with this: "The program reads in two file names." I think it is just a poorly worded task. Good job on your solve though, you pretty much nailed it if not for the poorly written requirements.