// how hard is it to simply write to a  (text) file?
// 
// last modified: 11-2-00
//			      

import  java.awt.*;
import  java.awt.event.*;
import  javax.swing.*;
import  java.io.*;

public class TryWriteToFile
{
        public static void main(String args[])
        {
                TryWriteToFileFrame thisFrame = new TryWriteToFileFrame();

		thisFrame.setSize(600, 400);
        
		thisFrame.setTitle("Trying to Simply Write to a File");
		thisFrame.show();
        }
}

class TryWriteToFileFrame extends JFrame implements ActionListener
{	
	JLabel			title, fileToWriteLabel;
	JTextArea		fileContents;
	JTextField 		fileToWriteField;
	JScrollPane		fileContentsPane;

	public TryWriteToFileFrame()
        {
		Container	myContentPane;

		myContentPane = getContentPane();
		myContentPane.setLayout(new FlowLayout());
                
		// gracefully handle a window closing event                      
                addWindowListener(new WindowAdapter()
                        {
                                public void windowClosing(WindowEvent e)
                                {
					System.exit(0);
                                }
                        });

		// this text area will hold names of files in current
		// directory; it is within a JScrollPane to provide
		// scrolling capabilities?
		fileContents = new JTextArea(10, 20);
				
		fileContentsPane = new JScrollPane(fileContents);

		myContentPane.add(fileContentsPane);

		fileToWriteLabel = new JLabel("type new file name: ");				
		myContentPane.add(fileToWriteLabel);

		fileToWriteField = new JTextField(20);
		fileToWriteField.addActionListener(this);
		myContentPane.add(fileToWriteField);
        }

	// when a file name is entered into textfield,
	// either complain or write textarea contents to
	// that filename in the current directory	
	public void actionPerformed(ActionEvent e)
	{
		String				fileToWriteName;
		File				fileToWrite;
		// another java.io option... made for writing text files in
		// particular (as opposed to binary files)
		FileWriter			toStream;

		fileToWriteName = fileToWriteField.getText();

		fileToWrite = new File(fileToWriteName);

		// is this currently a file name? No good if so!
		if (fileToWrite.exists())
		{
			fileToWriteField.setText("try again --- file " + 	
				fileToWriteName + " exists");
		}
		else
		{
			try
			{
				// instantiate FileWriter stream toStream,
				// use its write() method to write contents
				// of textarea to desired file.
				//
				// do not forget to close the file!
				toStream = new FileWriter(fileToWrite);
				toStream.write(fileContents.getText());
				toStream.close();
				fileToWriteField.setText("");
			}
			catch (FileNotFoundException exc)
			{
				// a failed opening of a file (a failed attempt
				// to instantiate toStream, above) could
				// throw a FileNotFoundException
				System.out.println("TryWriteToFile2: Could not open: "
					+ fileToWriteName);
			}
			catch (IOException exc)
			{
				System.out.println("TryWriteToFile: IOError: " +
					exc.getMessage());
			}
		}
	}
}