Thread: Need help to fix my code

please i need your help to fix my code...its actually running already but there's little problem..here's how it work first im adding data to a text file and now i need to delete it..my problem is when im going to press already the delete button all contents of the text field are being deleted.but i want to delete only the specific data that i typed in my textfield ..for example: i typed 123 on my text field and i press Add button then 123 will be added to the textfile("test.txt") then i want to delete it and now i will type 123 to the textfield and press delete button and now all data are deleted...that's my problem..pls i need your help hehe..any help will be appreciated
example of my textfile("test.txt")
hello //data i added
hello //data i added
hello //data i added
123 //data i added

            word = ("");
            word = inputOutputField.getText().trim(); //variable name of my textfield
 
            try{
                String lineToRemnove = null;
                BufferedReader bf = new BufferedReader(new FileReader("test.txt"));
                BufferedWriter writer = new BufferedWriter(new FileWriter("test.txt"));
 
                while (( lineToRemnove = bf.readLine()) != null){
                    if(lineToRemnove.equals(word)){
                    JOptionPane.showMessageDialog(null,"Data deleted!");
                    writer.write(word);  
                }
                writer.close();  
                bf.close();
                } 
            }catch (IOException E) {
                System.out.println("Error" + E);
            }

Originally Posted by Norm

Is this what you are trying to do:
There is a file with multiple lines.
If the user enters some text and presses the Delete button, the program is supposed to update the file by deleting the line that contains the text that was entered.

yes that's it

here's my code sir

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
 
 
public class Project9 extends JFrame implements ActionListener{
 
	private JTextField tf;
	private JButton addButton,searchButton,deleteButton;
    private String word;
 
	public static void main(String[]args){
	Project9 gui = new Project9();
    gui.setVisible(true);
}
 
public Project9()
{
	setTitle("File Manipulation");
	setSize(950,150);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	Container cp = getContentPane();
	cp.setLayout(new FlowLayout());
	JButton jb1 = new JButton("Add");
	jb1.setPreferredSize(new Dimension(150, 100));
	jb1.setFont(new Font("Verdana", Font.BOLD, 30));
	jb1.addActionListener(this);
	JButton jb3 = new JButton("Delete");
	jb3.addActionListener(this);
	jb3.setPreferredSize(new Dimension(150, 100));
	jb3.setFont(new Font("Verdana", Font.BOLD, 30));
	tf = new JTextField(30);
	add(tf);
	add(jb1);
	add(jb3);
}
 
public void actionPerformed(ActionEvent e)
{
	if (e.getActionCommand().equals("Add"))
	{
        word = ("");
        word = tf.getText().trim();
        try{
          	if (word.length() > 0)
            {
            	BufferedWriter out = new BufferedWriter(new FileWriter(new File("test.txt"), true));
                JOptionPane.showMessageDialog(null, "Data Added");
                out.write(word);
                out.newLine();
                out.close();
            }
            else
            {
                JOptionPane.showMessageDialog(null, "No Data Added");
            }
        }catch (IOException E)
        {
            System.out.println("Error" + E);
        }
    }
     else if (e.getActionCommand().equals("Delete"))
        {
            word = ("");
            word = tf.getText().trim();
 
            try{
                BufferedReader bf = new BufferedReader(new FileReader("test.txt"));
                BufferedWriter writer = new BufferedWriter(new FileWriter("test.txt"));
                String line = null;
 
                while (( line = bf.readLine()) != null){
                    if(line.contains(word)){
                    JOptionPane.showMessageDialog(null,"Data deleted!");
                    writer.write(word);
                }
                    writer.close();  
                    bf.close();
                } 
            }catch (IOException E) {
                System.out.println("Error" + E);
            }
 
        } 
}
}