Update Text File

[yuminstall]

Hi,

I have been making a banking system in Java, at the moment I have been trying to get it to recorded certain values to a text document which I have done. I cant seem however to get it to update the text file instead of recreating it each time.

Src:

import java.io.*;
public class storage {

	public static void main(String[] args) throws IOException{
			
			//Record Details
			Writer output = null;
		    String accountnumber = "number";
		    String accountname = "name";
		    String accounttype = "Normal";
		    String accountbalance = "£39,000";
		    String accountstatus = "enabled";
		    File info = new File("accounts.txt");
		    output = new BufferedWriter(new FileWriter(info));
		    
		    //Layout
		    output.write(" |");
		    output.write(" ");
		    output.write(accountnumber);
		    output.write(" |");
		    output.write(" ");
		    output.write(accountname);
		    output.write(" |");
		    output.write(" ");
		    output.write(accounttype);
		    output.write(" |");
		    output.write(" ");
		    output.write(accountbalance);
		    output.write(" |");
		    output.write(" ");
		    output.write(accountstatus);
		    output.write(" |");
		    output.close();
		    System.out.println("File Written.");        
		    

	}

}

[raffaele181188]

If I have understood you, then you should look at java.nio package
java.nio package
But I think you don't need that sophysticated feature....

[yuminstall]

all I need is some code to make it add a new line each time in the text document so every time it compiles it wont start a new file but just keep adding a line to the existing one.

[raffaele181188]

OK so all you need is a Reader to read your file in your program. THEN manipulate it and write it to disk with a Writer like you did

[yuminstall]

im not sure on the code for that, any chance you could give me an example?

[masijade]

This sort of thing is perfect for RandomAccessFile (although I believe that is, probably, far too advanced for you).

[CJSLMAN]

Check to see if the file exists and if it does, use the append method instead of the write method.

Luck,
CJSL

[yuminstall]

yeah the file exists and has the information in it, how would i change the code so it would use the append method instead?

[masijade]

See the API docs. Namely the constuctors for FileOutputStream (and other similar classes). Note, that is only useful for appending to the file, not for modifying the existing contents of the file.