Can you give me a hint?

Question about the task

Sequential file output

Java Core, Level 6, Lesson 13

Under discussion

I do not now how to set properly setFileName and getFileContents methods.

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; public class Solution { public static String firstFileName; public static String secondFileName; static { try { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); firstFileName = reader.readLine(); secondFileName = reader.readLine(); } catch (Exception e){ } } //write your code here 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(); f.join(); //write your code here System.out.println(f.getFileContents()); } public static class ReadFileThread extends Thread implements ReadFileInterface { public String filename = ""; public String name = ""; BufferedReader r = new BufferedReader(new InputStreamReader(System.in)); @Override public String getFileContents() { return name; } @Override public void setFileName(String fullFileName) { filename=fullFileName; } @Override public void run() { try { while (r.ready()) { name += r.readLine() + " "; } r.close(); } catch (Exception e){ } } @Override public void start() { } } public interface ReadFileInterface { void setFileName(String fullFileName); String getFileContents(); void join() throws InterruptedException; void start(); } //write your code here }

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Henk

Level 19 , Pretoria, South-Africa

30 May 2019, 08:00

your question is a bit vague... ? You say you don't know how to set the filename, and get the filename, but you are setting it already ?

Andrew

Level 29 , Seattle, United States

21 March 2019, 16:21

When you use the BufferedReader to get the file contents, you are asking it to get the contents from System.in rather than the file. It may be easier to keep track if you move the BufferedReader in ReadFileThread to run() since no other method needs to use it. Don't forget to close both of you BufferedReader streams.