Output

This application illustrates the use of the PrintWriter class for writing a stream of character data to a file. It also illustrates the use of chaining that is typical of Java I/O.

In this example, three classes are chained. You should look closely at their APIs.

PrintWriter

FileOutputStream

File

import java.awt.*;
import java.io.*;

public class Output  {

//  simplest write to a file

  public Output  ()  {
    super ();
  }  // end Output  constructor

  public static void main ( String [ ] args )  {

  File outFile;
  FileOutputStream outFileStream;
  PrintWriter outPrintWriter;

  String fileName;
  String path;

  String message1 = new String ( "Hello, World!" );
  String message2 = new String ( "Hello, World, again." );

  Output writeAppl = new Output ();

  // Instantiate the file
  if ( args.length > 0 ) fileName = args[0];
  else {
    fileName = new String ( "testfile" );
    path = new String ( "." );
  }
  if ( args.length > 1 ) path = args[1];
  else path = new String ( "." );

  // Instantiate the file object
  outFile = new File ( path, fileName );

  // Instantiate and chain the FileOutputStream
  try {
    outFileStream = new FileOutputStream ( outFile );
    }  // end try
  catch ( IOException except ) {
    return;
    }  // end catch

  // Instantiate and chain the PrintWriter
  outPrintWriter = new PrintWriter ( outFileStream );

  System.out.println ( "Writing to file: " + outFile.getName() );

    outPrintWriter.println ( message1 );
    outPrintWriter.println ( message2 );

  // flush buffer
    outPrintWriter.flush();

  // messages to user
    System.out.println ( message1 );
    System.out.println ( message2 );


  }  // end main

}  // end Output