This function saves a simple file with the name "filename", which contains
the message "hello world". java.io.* must be imported first.

public boolean SaveTXTfile(String filename) {
	private FileOutputStream fout;
	private PrintWriter myOutput;
	
	// Saving the results on the file
	try {
		fout=new FileOutputStream(filename);
		myOutput=new PrintWriter(fout, true);

		myOutput.println("hello world");
	} catch (IOException e) {
		return false; 	// Error occured
	}

	// Closing the text file
	try {
		myOutput.flush();
		myOutput.close();
		fout.flush();
		fout.close();
	} catch(IOException e) {
		return false;
	}

	return true;	// Text file saved successfully
}