Java write/append to each line of a text file

Question

I have spent numerous hours trying to figure out what I am doing wrong. If anyone more experienced could tell me what is wrong with my code.
I have a very simple text file with 5 lines:
line1
line2
line3
line4
line5
All I am trying to do is append some string to the end of each of those lines. Everytime I run my code, it erases all content but does not write/append anything to the file. Any help is greatly appreciated.
Thanks! I am about to throw this monitor out the window!!
package Chapter6;
import java.io.*;
public class fileNavigation2 {
     public static void main(String[] args) {
          File dir = new File("C:\\testing");
          System.out.println(dir.isDirectory());
          try {
               File file = new File(dir, "Test.txt");
               FileReader fr = new FileReader(file);
               BufferedReader br = new BufferedReader(fr);
               FileWriter fw = new FileWriter(file);
               BufferedWriter bw = new BufferedWriter(fw);
               String s = "Add1,";
               String s2 = "Add2\n";
               String str;
               while((str = br.readLine()) != null) {
               StringBuffer sb = new StringBuffer(str);
               sb.append(s + s2);
               String y = sb.toString();
               System.out.println(sb);
               System.out.println("Appending");
               bw.write(y);
               bw.close();
               System.out.println("Done");
          }catch(IOException e) {}
}

Answer 1

First, thanks a lot for your feedback. The code makes a lot of sense but it does not update the content of my Test.txt file.
I only edited the line of code that creates the new file so that it could find the location of the file.
Scanner file = new Scanner(new File("C:\\testing",fileName));==============================
The code now looks like:
import java.io.*;
import java.util.*;
public class Main {
    static void appendTo(String fileName, String[] newLines) throws IOException {
        List<String> allLines = getLinesFrom(fileName);
        for(String line : newLines) {
            allLines.add(line);
        writeLinesTo(fileName, allLines);
    static List<String> getLinesFrom(String fileName) throws IOException {
        List<String> lines = new ArrayList<String>();
        Scanner file = new Scanner(new File("C:\\testing",fileName));
        while(file.hasNextLine()) {
            lines.add(file.nextLine());
        file.close();
        System.out.println(lines);
        return lines;
    static void writeLinesTo(String fileName, List<String> lines) throws IOException {
        BufferedWriter out = new BufferedWriter(new FileWriter(fileName));
        for(String line : lines) {
            out.write(line);
            out.write(System.getProperty("line.separator"));
        out.close();
    public static void main(String[] args) {
        String fileName = "Test.txt";
        String[] extraLines = {
                "a new line",
                "and yet another new line"
        try {
            appendTo(fileName, extraLines);
            System.out.println("Done.");
        } catch (IOException e) {
            e.printStackTrace();
}Again, thanks for the help.