/* ReadTextFile.java        Authors: Koffman & Wolz
 * Demonstrates reading data from a text file.
 * Uses FileReader, BufferedReader,
 * FileWriter, and PrintWriter.
 */
import java.io.*;
import javax.swing.JOptionPane;

public class ReadTextFile {

   public static void main(String[] args) {

      try {
        // Create object ins - the input file.
        String inFileName = 
               JOptionPane.showInputDialog("Input file name?");
        FileReader inStream = new FileReader(inFileName);
        BufferedReader ins = new BufferedReader(inStream);

        // Create object outs - the output file
        String outFileName = 
               JOptionPane.showInputDialog("Output file name?");
        FileWriter outStream = new FileWriter(outFileName);
        PrintWriter outs = new PrintWriter(outStream);

        // Read the number of data lines.
        int numLines = Integer.parseInt(ins.readLine());

        // Read the data lines from the input file.
        //   and write them to the output file
        for (int lineCount = 0; lineCount < numLines; lineCount++)  {
           String dataLine = ins.readLine();
           outs.println(dataLine);
        }

        // Write message to console and close files.
        System.out.println(numLines + " data lines written to file " +
                           outFileName);
        ins.close();
        outs.close();
      }
      catch (IOException ex) {
        System.out.println("i/o error: " + ex.getMessage());
        ex.printStackTrace();
      }
      catch (NumberFormatException ex) {
        System.out.println(ex.getMessage());
        ex.printStackTrace();
      }
   }
}