Question

Write a program that reads a file (provided as attachment to this assignment) and write the file to a different file with line numbers inserted at the beginning of each line. Such as Example File Input: This is a test Example File Output 1. This is a test. (Please comment and document your code and take your time no rush).

Answer 1

package file;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class FileTextTransfer {
   public static void main(String[] args) throws IOException {
       File file = new File("."); // . indicates current directory or project.
       String source = file.getCanonicalPath() + File.separator + "Source.txt";
       String dest = file.getCanonicalPath() + File.separator + "Destination.txt";
       // creating a file object
       File srcFile = new File(source);
       // providing actual path of file.
       FileInputStream fistream = new FileInputStream(srcFile);
       //BufferedReader class is used to read the text from a character-based input stream.
       BufferedReader bReader = new BufferedReader(new InputStreamReader(fistream));
       // FileWriter class is used to write character-oriented data to a file along with a boolean
       //indicating whether or not to append the data written. If boolean is true, then data will be
       // written to the end of the file rather than the beginning.
       FileWriter fwriter = new FileWriter(dest, true);
       //BufferedWriter class is used to provide buffering for File Writer instances.
       BufferedWriter outWriter = new BufferedWriter(fwriter);
       String appendLine = null;
       int readCount=1,writeCount=1;
       // while will execute until readLine() is not null.
       while ((appendLine = bReader.readLine()) != null) {
           readCount++;   // reading count increment if reads 1 line.
           //Process each line and add to output to Destination.txt file with line numbers.
           appendLine=writeCount+". "+appendLine;
           // writing line into BufferedWriter.
           outWriter.write(appendLine);
           // after reading line providing new line.
           outWriter.newLine();
           // incrementing writeCount after writing 1 line .
           writeCount++;
       }
       // if reading successfull and writing successfull then only print file transfer successfully.
       if(readCount==writeCount) System.out.println("File text transfer successfully....!!!");
       else System.out.println("File not send successfully.....!!");
       // closing the buffer reader
       bReader.close();
       // closing the buffer writer
       outWriter.close();
   }
}