Emptying a Text File

[Zelaine]

Hello!

To print a text into a file you can do like this:

import java.io.*;

public class tjena{
	public static void main(String[] args){
		try{
			java.io.PrintStream ps = new java.io.PrintStream("hej.txt");
			ps.println("Hello World!");
			ps.close();
		}catch(FileNotFoundException e){
		}
	}
}

However, this always empties the file of earlier contents. So how does one print into a text file without emptying it?

Thanks in advance! :)

[jim829]

Check out the Java API's for file I/O. Some of the constructors allow opening for append.

Regards,
Jim

[Zelaine]

I did what you said and found this code, but it doesn't open the file for append, nor does it output anything at all in the file or gives me a message that the file was not found.

import javax.swing.*;
import java.io.*;

public class tjena{
	public static void main(String[] args){
		try{
			PrintStream ps = new PrintStream(new FileOutputStream("hej.txt", true));
			ps.println("Hej!");
			ps.close();
		}catch(FileNotFoundException e){
			JOptionPane.showMessageDialog(null, "File not found!");
		}
	}
}

[XNOViiCE]

This should help you out with what you are trying to do.

How to append text to an existing file in Java - Stack Overflow

[jim829]

Well, that's because you didn't specify the correct file path. The above worked for me just fine.

Regards,
Jim

[Zelaine]

But the program must have found the file, it would have told me otherwise because of the "FileNotFoundException". Or was that not what you meant?

[jim829]

Ah, Sorry. I misread your message. When you open a file for writing, it creates the file for you. If the file is already there, it opens it and writes to the end. What IDE are you using,if any?

Regards,
Jim

[Zelaine]

I'm using Eclipse :)

[jim829]

So do I. It stores the file at the project level (i.e. inside the project). You may need to do a refresh to see it.

Regards,
Jim

[Zelaine]

Yeah, I found it :) Thanks for the help!