Java - do not overwrite with buffer

Question

I have a program that adds people to arraylist. What I'm trying to do is add these persons to a text file, but the program overwrites the first line so that people are erased.

How to tell the compiler to write the next free line?

import java.io.*; import java.util.*; import javax.swing.JTextArea; public class Logic { File file; FileWriter fw; FileReader fr; BufferedWriter bw; ArrayList<Person> person; public Logic() { try { file = new File("register.txt"); if (!file.exists()) { file.createNewFile(); } } catch (IOException e) { } person = new ArrayList<Person>(); } // Add person public void addPerson(String name, int tele) { person.add(new Person(name, tele)); savePerson(name, tele); } // Save person to external file public void savePerson(String name, int tele) { try { fw = new FileWriter(file.getName()); bw = new BufferedWriter(fw); String tel = Integer.toString(tele); bw.write(name + "\t" + tel); bw.newLine(); bw.close(); } catch (Exception e) { System.out.println("skrev inte ut med buffered"); } } // Går in i alla objekt av klassen Person och skriver ut toString i // textArean public void visaAlla(JTextArea textRuta) { textRuta.setText(""); // for(Person p:person) // { // textRuta.append(p.toString()); // } try { fr = new FileReader(file.getName()); BufferedReader in = new BufferedReader(fr); String str; while ((str = in.readLine()) != null) { textRuta.append(str); } } catch (Exception e) { System.out.println("gickcinte "); } } } 

Answer 1

FileWriter takes an optional boolean argument that indicates whether to add or overwrite existing content. Go to true if you want to open the file for recording in add mode.