// Filename TrivialFileDemo.java.
// Read a text file called "test.txt" and output to 
// the terminal. 
//
// Written for JFL Book Chapter 12.
// Fintan Culwin, V 0.1, Jan 1997. 
// Modified by X. Meng using some compatible features and output file

import java.io.*;

class TrivialFileDemo { 
 
    public static void main(String args[]) {
    
    DataInputStream in;
    PrintStream out;
    
       try { 
          in  = new DataInputStream( 
                        new FileInputStream( "test.txt"));
          out = new PrintStream (
                        new FileOutputStream( "test.out"));
                        
          String line = in.readLine();
          while ( line != null ) { 
             System.out.println(line);
             out.println(line);
             line = in.readLine();
          } // end while
          
          in.close(); 
          out.close();
       } catch ( java.io.IOException exception)  { 
         if ( exception instanceof FileNotFoundException) { 
            System.out.println(
               "A file called test.txt could not be found, \n" +
               "or could not be opened.\n"                     +
               "Please investigate and try again.");
         } 
       } // End try/ catch block.
    } // end main.
    
 } // End class.