Help! Using GUI button to update text file

Question

Desperately needing help on the following:
As you will see, I have created two classes - one for reading and writing to a text file on my hard drive, and one for the GUI with two buttons - Display and Update. The Display button works perfectly in that it displays text from a file path. The Update button, however, does not work correctly. I seek for the Update button to update any edits to the same exact text file I view using the Display button.
Any help would be greatly appreciated. Thanks!
Class TextFile
import java.io.*;
public class TextFile
    public String read(String fileIn) throws IOException
        FileReader fr = new FileReader(fileIn);
        BufferedReader br = new BufferedReader(fr);
        String line;
        StringBuffer text = new StringBuffer();
        while((line = br.readLine()) != null)
          text.append(line+'\n');
        return text.toString();
    } //end read()
    public void write(String fileOut, String text, boolean append)
        throws IOException
        File file = new File(fileOut);
        FileWriter fw = new FileWriter(file, append);
        PrintWriter pw = new PrintWriter(fw);
        pw.println(text);
        fw.close();
    } // end write()
} // end class TextFileClass TextFileGUI
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class TextFileGUI implements ActionListener
    TextFile tf = new TextFile();
    JTextField filenameField = new JTextField (30);
    JTextArea fileTextArea = new JTextArea (10, 30);
    JButton displayButton = new JButton ("Display");
    JButton updateButton = new JButton ("Update");
    JPanel panel = new JPanel();
    JFrame frame = new JFrame("Text File GUI");
    public TextFileGUI()
        panel.add(new JLabel("Filename"));
        panel.add(filenameField);
        panel.add(fileTextArea);
        fileTextArea.setLineWrap(true);
        panel.add(displayButton);
        displayButton.addActionListener(this);
        panel.add(updateButton);
        updateButton.addActionListener(this);
        frame.setContentPane(panel);
        frame.setSize(400,400);
        frame.setVisible(true);
    } //end TextFileGUI()
    public void actionPerformed(ActionEvent e)
        if(e.getSource() == displayButton)
            String t;
            try
                t = tf.read(filenameField.getText());
                fileTextArea.setText(t);
            catch(Exception ex)
                fileTextArea.setText("Exception: "+ex);
            } //end try-catch
        } //end if
        else if(e.getSource() == updateButton)
            try
              tf.write(filenameField.getText());
            catch(IOException ex)
                fileTextArea.setText("Exception: "+ex);
            } //end try-catch
        } //end else if
     } //end actionPerformed()
} //end TextFileGUI

Answer 1

Here's your working example.
In my opinion u do not have to append \n when u reading the file
Look the source, if u have some problem, please, ask me.
Regards
public class TextFileGUI implements ActionListener
TextFile tf = new TextFile();
JTextField filenameField = new JTextField(30);
JScrollPane scrollPane = new JScrollPane();
JTextArea fileTextArea = new JTextArea();
JButton displayButton = new JButton("Display");
JButton updateButton = new JButton("Update");
JPanel panel = new JPanel();
JFrame frame = new JFrame("Text File GUI");
public static void main(String args[])
new TextFileGUI();
public TextFileGUI()
panel.setLayout(new BorderLayout());
JPanel vName = new JPanel();
vName.setLayout(new BorderLayout());
vName.add(new JLabel("Filename"), BorderLayout.WEST);
vName.add(filenameField, BorderLayout.CENTER);
panel.add(vName, BorderLayout.NORTH);
scrollPane.setViewportView(fileTextArea);
panel.add(scrollPane, BorderLayout.CENTER);
fileTextArea.setLineWrap(true);
JPanel vBtn = new JPanel();
vBtn.setLayout(new FlowLayout());
vBtn.add(displayButton);
displayButton.addActionListener(this);
vBtn.add(updateButton);
updateButton.addActionListener(this);
panel.add(vBtn, BorderLayout.SOUTH);
frame.setContentPane(panel);
frame.setSize(400, 400);
frame.setVisible(true);
} // end TextFileGUI()
public void actionPerformed(ActionEvent e)
if (e.getSource() == displayButton)
String t;
try
t = tf.read(filenameField.getText());
fileTextArea.setText(t);
catch (Exception ex)
ex.printStackTrace();
else if (e.getSource() == updateButton)
try
tf.write(filenameField.getText(), fileTextArea.getText(), false);
catch (IOException ex)
ex.printStackTrace();
} // end try-catch
} // end else if
} // end actionPerformed()
} // end TextFileGUI
class TextFile
public String read(String fileIn) throws IOException
String line;
StringBuffer text = new StringBuffer();
FileInputStream vFis = new FileInputStream(fileIn);
byte[] vByte = new byte[1024];
int vPos = -1;
while ((vPos = vFis.read(vByte)) > 0)
text.append(new String(vByte, 0, vPos));
vFis.close();
return text.toString();
} // end read()
public void write(String fileOut, String text, boolean append) throws IOException
File file = new File(fileOut);
FileWriter fw = new FileWriter(file, append);
PrintWriter pw = new PrintWriter(fw);
pw.println(text);
fw.close();
} // end write()
} // end class TextFile