import java.io.*;

public class FileExample {
    public static void main (String [] args) {
        BufferedReader br;
        FileReader fr;
        FileWriter fw;
        PrintWriter pw;
	   String s = "";
	   String wholeString = "";
	   int i = 1;
	   try {
	   fr = new FileReader("data.txt");
	   br = new BufferedReader(fr);
        // Read text from file and append on line count and 
        // newlines
	   while (s != null) {
		s = br.readLine();
		if (s != null) {
		   System.out.println(s);
		   wholeString = wholeString + i + " " + s + "\n";
		}
		i = i + 1;
	    }   
	    br.close();
	}
	catch (FileNotFoundException e) {
         System.out.println("data.txt not in current folder"); 
	    e.printStackTrace();
	}
	catch (IOException e) {
	    e.printStackTrace();
	}

     // Write the appended text from above to file (includes line
     // numbering and extra newlines).
	try {
	    fw = new FileWriter("data_appended.txt");
	    pw = new PrintWriter(fw);
	    pw.write(wholeString);
	    fw.close();
	}
	catch (IOException e) {
	    e.printStackTrace();
	}
	
    }
}