Thread: JAVA = Replace a line in a text file

I want to create a program that will replace some of the text within a text file, however when I attempt to do so it deletes the rest of the file so I'm left with just the replaced line.

For example if i want to change the fourth record from e to d it deletes items within the file.

Text File before
1 a
2 b
3 c
4 e

Text File after
4 d

Can anyone help??

//package org.kodejava.example.io;
 
import java.io.*;
import java.util.*;
 
public class LineNumberReaderExample {
    public static void main(String[] args) throws Exception {               
        File file = null;
        FileReader fr = null;
        LineNumberReader lnr = null;
 
        try {
            Scanner input=new Scanner(System.in);
            System.out.print("Enter record to edit ");
            String word=input.next();
            file = new File("file.txt");
            fr = new FileReader(file);            
            lnr = new LineNumberReader(fr);
            String line = "";
 
            while ((line = lnr.readLine()) != null) {
                if(line.startsWith(word)){
 
                System.out.println("Line Number " + lnr.getLineNumber() + ": " + line);
                String[] st = line.split(" ");
                String date = st[0];
                String event = st[1];
 
                System.out.print("Replace With: ");
                String newtext=input.next();
                FileWriter writer = new FileWriter("file.txt");
                writer.write(line.replace(event, newtext));
                writer.close();
                }     
 
            }
        } 
       finally {
            if (fr != null) {
                fr.close();
            }
            if (lnr != null) {
                lnr.close();
            }
        }
    }
}

Once I get this code working I can then save dates and events to the text file.

Sorry I've changed my method of saving now. Ignore this thread

Could you please upload your final codes? Thanks

Probably not, since this topic is several months old. Start a new topic if you need help to solve a similar problem.