How To Re-Input More Data To A Text File?

Question

I was wondering if anyone could tell me how to re-input more data into a text file? I don't want to over-write the text file, but just add more data to it. The current code i have is:
import java.util.Scanner;
import java.io.*;
class trialanderror002 {     
public static void main(String args[]){     
     Scanner input = new Scanner(System.in);
     String str;
FileOutputStream out;
PrintStream p;
try{
     out = new FileOutputStream("c:\\products.txt");
     p = new PrintStream(out);
     System.out.println("Please insert text to be written to file...");
     str = input.next();
     p.println (str);
     p.close();
catch (Exception e){
     System.err.println ("Error writing to file");
Basically, after each time the program is ran, i'd like to insert another line of data into products.txt.
Is there a way for me to loop the program too and not remove the data from the text file?
thanx...

Answer 1

just one more question...
i've figured out the code to retrieve the text file and print it to screen...but how do i go about only printing parts of my text file?
So supposing my text file has 5 lines of data/text etc, how would i make it print the first line?...or the second line?...or the third....etc etc...
the current code i now have is:
package Assignment1;
import java.util.Scanner;
import java.io.*;
class trialanderror002 {     
public static void main(String args[]){     
     Scanner input = new Scanner(System.in);
     String str;
FileOutputStream out;
PrintStream p;
try{
     out = new FileOutputStream("c:\\trial.txt", true);
     p = new PrintStream(out);
     System.out.println("Please insert text to be written to file...");
     str = input.next();
     p.println (str);
     p.close();
catch (Exception e){
     System.err.println ("Error writing to file");
          try {
          FileReader file = new
          FileReader("c:\\trial.txt");
          BufferedReader buff = new
          BufferedReader(file);
          boolean eof = false;
          while (!eof){
               String line = buff.readLine();
               if (line == null)
                    eof = true;
               else
                    System.out.println(line);
          buff.close();
          }catch (IOException e){
               System.out.println("Error -- " + e.toString());
}