Not passing the 5th task

Question about the task

Sequential file output

Java Core, Level 6, Lesson 13

Under discussion

Not sure what I need to change. Any help is appreciated. Thanks in advance.

1. Figure out what the program does.
2. In a static block, read 2 filenames: firstFileName and secondFileName.
3. Inside the Solution class, create a public static ReadFileThread class that implements the ReadFileInterface interface (Think about what is more appropriate: Thread or Runnable).
3.1. The setFileName method must set the name of the file whose contents will be read.
3.2. The getFileContents method must return the contents of the file.
3.3. In the run method, read the contents of the file and close the stream. Separate the lines of the file with spaces.
4. Think about where you need to wait for the thread to finish to ensure that the files are displayed sequentially.
4.1. To do this, add a call to the appropriate method.

Expected output:
[entire contents of the first file] [entire contents of the second file]

Requirements:

The Solution class's static block should read from the console the names of two files and store them in the variables firstFileName and secondFileName.
In the Solution class, declare the public static ReadFileThread class.
The ReadFileThread class must implement the ReadFileInterface interface.
The ReadFileThread class must inherit the appropriate class.
The ReadFileThread class's run method should read lines from the file set by the setFileName method. And the getFileContents method of this same class must return the file contents. The return value is one string consisting of the lines of the file, separated by spaces.
The systemOutPrintln method must call the join method on the created object f.
The program's output should consist of 2 lines. Each line contains the contents of one file.

package com.codegym.task.task16.task1630; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.FileNotFoundException; public class Solution { public static String firstFileName; public static String secondFileName; //write your code here // created bufferedReader // read two file names static { try { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); firstFileName = reader.readLine(); secondFileName = reader.readLine(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) throws InterruptedException { systemOutPrintln(firstFileName); systemOutPrintln(secondFileName); } public static void systemOutPrintln(String fileName) throws InterruptedException { ReadFileInterface f = new ReadFileThread(); f.setFileName(fileName); f.start(); //write your code here f.join(); System.out.println(f.getFileContents()); } public interface ReadFileInterface { void setFileName(String fullFileName); String getFileContents(); void join() throws InterruptedException; void start(); } public static class ReadFileThread extends Thread implements ReadFileInterface { public FileReader fr; public void setFileName(String fullFileName) { try { fr = new FileReader(fullFileName); } catch (FileNotFoundException e) { e.printStackTrace(); } } public String getFileContents() { String res = ""; String line; try { BufferedReader br = new BufferedReader(fr); while ( (line = br.readLine()) != null) { res += line + " "; } } catch (Exception e) { e.printStackTrace(); } return res; } public void start() { } public void run() { } } //write your code here }

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

2 September 2021, 11:49

I have not gone into this code in depth. Just what I suddenly noticed: your run() method is completely empty! But You should write everything the thread needs to do in the run(). (In this case, file reading.)