How to write it to a file?

Question

I need some help with the following code. I think I understand what is happening, but I just don't know what to do to change it. I am attempting to 1.Open a .txt File and read its contents using a BufferedReader. 2. Create two HashSets - one to hold the unique strings from the file and another to hold the duplicate strings from the file. 3.Iterate through each line of the file and if it is NOT unique, add it to the duplicate HashSet, if it IS unique, do nothing withit. 5. Remove the duplicates from the uniques HashSet and print out to a .txt file (using BufferedWriter)the balance of what is left (which should be just the unique strings.)
Here is the code:
import java.util.*;
import java.io.*;
public class WriteToDups2
{ // Open Class WriteToDups2
    public static void main(String[] args)
    { // Open Main
          // Read words from file
          try { // Open Outer Try
                  BufferedReader in = new BufferedReader(new FileReader("Pal_out2.txt"));
                  BufferedWriter out = new BufferedWriter(new FileWriter("Palslm.txt"));
                    Set dups = new HashSet();
                  String str;
                  while ((str = in.readLine()) != null)
                  { // Open While
                         Set uniques = new HashSet();
                         for (int i=0; i<args.length; i++)
                         { // Open For
                              if (!uniques.add(args))
                              {// Open IF
                                   dups.add(args[i]);
                              }// Close IF
                              //uniques.removeAll(dups); //Destructive set-difference
                              Set uniques2 = new HashSet(uniques); // Non-Destructive set-difference
                              uniques2.removeAll(dups);               // Non-Destructive set-difference
                         } // Close FOR
                         try {//Open Inner Try
                              out.write(uniques2);
                         }catch (IOException e) // Close Inner Try
                         { // Open Inner Catch
                         } // Close Inner Catch
               }//Close WHILE
               out.close();
          in.close();
          } catch (IOException e) // Close Outer Try
          { // Open Outer Catch
               } // Close Outer Catch
     }//Close Main
}//Close Class WriteToDups2
What am I doing wrong? The error message I get when compiling is as follows:
D:\jsdk14102\WriteToDups2.java:46: cannot resolve symbol
symbol  : variable uniques2
location: class WriteToDups2
                                out.write(uniques2);Please help!!
Thanks in advance...

Answer 1

Ok...I moved the HashSet declarations to the beginning of the code. But I still get the following error:
D:\jsdk14102\WriteToDups2.java:45: cannot resolve symbol
symbol  : method write (java.util.HashSet)
location: class java.io.BufferedWriter
                                out.write(uniques2);Here is how I changed the code:
import java.util.*;
import java.io.*;
public class WriteToDups2
{ // Open Class WriteToDups2
    public static void main(String[] args)
    { // Open Main
         HashSet uniques = new HashSet(), uniques2 = new HashSet();
          // Read words from file
          try { // Open Outer Try
                  BufferedReader in = new BufferedReader(new FileReader("Pal_out2.txt"));
                  BufferedWriter out = new BufferedWriter(new FileWriter("Palslm.txt"));
                    Set dups = new HashSet();
                  String str;
                  while ((str = in.readLine()) != null)
                  { // Open While
                         //Set uniques = new HashSet();
                         for (int i=0; i<args.length; i++)
                         { // Open For
                              if (!uniques.add(args))
                              {// Open IF
                                   dups.add(args[i]);
                              }// Close IF
                              //uniques.removeAll(dups); //Destructive set-difference
                              //Set uniques2 = new HashSet(uniques); // Non-Destructive set-difference
                              uniques2.removeAll(dups);               // Non-Destructive set-difference
                         } // Close FOR
                         try {//Open Inner Try
                              out.write(uniques2);
                         }catch (IOException e) // Close Inner Try
                         { // Open Inner Catch
                         } // Close Inner Catch
               }//Close WHILE
               out.close();
          in.close();
          } catch (IOException e) // Close Outer Try
          { // Open Outer Catch
               } // Close Outer Catch
     }//Close Main
}//Close Class WriteToDups2
I think there is something wrong with the way I am attempting to write it out to the new file. What do you think?