E-mail addresses and filtering duplication

Question

Duplicate address
I have a stand alone application that I wrote in Java to read email addresses from a csv file into a buffer and then it is supposed to filter out any duplicates, then write the unique smtp addresses into a new csv file to be veiwed in Excel.
However, this does not work. It is sending all the addresses to the new csv file so I am unsure what I have done wrong.
I belive the issue may be down to the delimiter.
Please see my code below:
import java.io.*;
import java.util.*;
class IS_CustSurvey
     public static void main(String[] args) throws Exception
          String dirName = "c:\\CustReps";          // New string to hold directory path
          String file = "c:\\CustReps\\today.csv";// New string to hold path to input file
          String put = "c:\\CustReps\\report.csv";// New string to hold path of output file
          File out = new File(put);                    // File pointer to output file
          String tmpString = new String();          // New string object
          String InputString = new String();          // New string object
          Random Selection = new Random();          // New math object
          Set MySet = new HashSet();           // New collection
          int dupCount = 0; // Set duplicate counter to zero
          int USC = 0;          // Set the unique string counter to zero
          int i = 0;               // Initialize integer i to zero
          int pcnt = 60; // The default percentage is 60%
          try
                    File dir = new File(dirName);     // File object for directory
                    if(!dir.exists())                    // If directory does not exist
                         dir.mkdir();
                    }                         // ...create it
                    else
                         if(!dir.isDirectory())
                              System.err.println(dirName + " is not a directory");
                              return;
                    File aFile = new File(dir, "report.csv");     // File object for directory
                    if(!aFile.exists())                    // If file does not exist
                         aFile.createNewFile();
                    }                         // ...create it
                    else
                         if(!aFile.isFile())          //If it's not a file...i.e. a directory,
                         {                         //a corrupted file or a non compatable source
                              System.err.println(aFile + " is not a file");//This message is displayed
                              return;
                    File bFile = new File(dir, "today.csv");//Check to see if the file is there
                    if(!bFile.exists())
                         System.out.println("Please put the file today.txt in the CustReps folder");//If the file is not there ask for it
                    else
                         if(!bFile.isFile())     // If it's not a file...as above
                              System.err.println(bFile + " is not a file");
                              return;
               catch(Exception e)
                    e.printStackTrace();
                              // Create a BufferedReader for the input file
          BufferedReader br = new myFileReader("C:\\CustReps\\today.csv").getFile();
          while((InputString = br.readLine()) != null)//Read in a line while there is data
               tmpString += InputString;
          String MyString[] = tmpString.split("\"");//Split the data & put it into an array
          int count = MyString.length;     //Get the length of the array
          // look for duplicates here.
          for(int lc1 = 0; lc1 < count; lc1++)//Loop counter 1 for
               for(int lc2 = (lc1+1);lc2 < count; lc2++)//Loop counter 2 for
                    if(MyString[lc1].matches(MyString[lc2]))//Compare lc1 with lc2
                         if(!MyString[lc1].matches("Empty"))
                              MyString[lc2] = "Empty";//Put empty into the elements in lc2
                              dupCount++;     //Increment the duplicate counter
          USC     = (count-dupCount); // Make the Unique String Counter equal to
                                        // all elements minus the duplicate count
          String UniqueString[] = new String[USC]; // Make a new string array with
                                                            // the value of the Unique String Counter
          // Create new string array...
          for(int lc = 0;lc < USC; lc++)// The loop counter for the Unique String Counter
               if(!MyString[lc].matches("Empty"))//Loop for non emptys
                    UniqueString[i++] = MyString[lc];
          int prcnt = ((USC*pcnt) /100);// Percent = the Unique String Counter multiplied by 10
                                                  // and divided by 100 to get ten percent
          if((prcnt <= 0) && (count > 0)) // If 10 percent is less than zero & the total array
          {                                             //is greater than zero
            prcnt = 1;                              //Percent equals one.
          System.out.println("Array size = " + USC); //Display the amount of unique elements
          System.out.println("10 Percent = " + prcnt);//Display ten percent of them
          int idx = 0; //Set index to zero
          // Should loop from 0 to prcnt...
          for(int lc = 0;lc < prcnt; lc++)
               do
                    idx = Selection.nextInt(USC);
                    BufferedWriter bw = new BufferedWriter(new FileWriter(out.getPath(), true));
                    PrintWriter pw = new PrintWriter(bw);
                    pw.println(UniqueString[idx]);
                    pw.close();
               }while(!MySet.add(UniqueString[idx]));
               System.out.println(UniqueString[idx]);          
class myFileReader
     private String file = null;
     myFileReader(String InPath)
          this.file = InPath;
     public BufferedReader getFile() throws Exception
          BufferedReader br = new BufferedReader(new FileReader(file));
          return(br);
}Any help would be really appreciated.

Answer 1

Instead of matches use equals. You can also join the two if statements into one like this
if (MyString[lc1].equals(MyString[lc2] && !MyString[lc1].equals("Empty"))
Also consider using toUpperCase/toLowerCase and using other kinds of collections. I am not sure of the name of one of them which doesn't require specifying a size (ArrayList) to add unique emails addresses when the above statement (if statement) is true instead of starting a new loop.