Nrthugu

Hello i need to delete a specific line from text file after ID search p.g. ID=2

students.txt

1,Giannis,Oreos,Man

2,Maria,Karra,Woman

3,Maria,Oaka,Woman

And after search and delete to get:

students.txt

1,Giannis,Oreos,Man  

3,Maria,Oaka,Woman

But is not working properly

Code so far:

    @FXML

    TextField  ID2;

    @FXML       

        public void UseDelete() throws IOException {

            File inputFile = new File("src/inware/students.txt");

            File tempFile = new File("src/inware/studentsTemp.txt");



            BufferedReader reader = new BufferedReader(new FileReader(inputFile));

            BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));



            String lineToRemove = ID2.getText();

            String currentLine;



            while ((currentLine = reader.readLine()) != null) {

                // trim newline when comparing with lineToRemove

                String trimmedLine = currentLine.trim();

                if (trimmedLine.equals(lineToRemove)) {

                    continue;

                }

                writer.write(currentLine + System.getProperty("line.separator"));

            }

            writer.close();

            reader.close();

            boolean successful = tempFile.renameTo(inputFile);

        }

If you want to remove a line by a line number I guess you can do a change to your code like this. You can give the int value of Id to the lineToRemove variable instead of my hard coded value

import java.io.*;



public class A {



    public static void main(String args) throws IOException {

        new A().useDelete();

    }



    public void useDelete() throws IOException {

        File inputFile = new File("src/inware/students.txt");

        File tempFile = new File("src/inware/studentsTemp.txt");



        BufferedReader reader = new BufferedReader(new FileReader(inputFile));

        BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));



        int lineToRemove = 2;

        String currentLine;

        int count = 0;



        while ((currentLine = reader.readLine()) != null) {

            count++;

            if (count == lineToRemove) {

                continue;

            }

            writer.write(currentLine + System.getProperty("line.separator"));

        }

        writer.close();

        reader.close();

        inputFile.delete();

        tempFile.renameTo(inputFile);

    }

}