Java Programming

hi all. trying to compile this program, but returns an error message stating the

"TreeSet<DeliveryHouseDetails> inputLines = ... " 

is an

 "unreachable statement" 

and points to the

"inputLines" 

part. Any ideas at all? Thanks for all responses.

import java.util.*;
import java.io.*;

public class StreetOrder
{
  public static void main(String [] args) throws IOException
  {
    try
    {
    
     String inputFileName = args[0];
    String outputFilename = args[1];
    
     if (args.length != 2)
       // Check this before opening files
       throw new ArrayIndexOutOfBoundsException
	   ("Two filenames needed: inputFilename outputFilename");
    
    // Read from the input file and print out to an output file.
    BufferedReader in
        = new BufferedReader(new FileReader(inputFileName));
    PrintWriter out
        = new PrintWriter(new FileWriter(outputFilename));
    
    // Check that the input file exists.    
    File inputFile = new File(inputFileName);
    if (inputFile.exists() == false);
      throw new FileNotFoundException
	     ("Input file " + args[0] + " does not exist.");
 
    // An tree set to store DeliveryHouseDetails objects.
    TreeSet<DeliveryHouseDetails> inputLines = new TreeSet<DeliveryHouseDetails>();

   String line;
   int number = 1;
   
   // For each line added to the tree set, create a new DeliveryHouseDetails
   // object for it. As it's a tree set, it automatically orders each entry
   // as they are added - according to the order as desribed in the
   // DeliveryHouseDetails class.
   while ((line = in.readLine()) != null)
   {
     inputLines.add(new DeliveryHouseDetails(number, line));
     number++;
   }

   // Throw a new exception if the contents of the input file is empty.
   if (inputLines == null || inputLines.size() == 0)
                        throw new Exception("This file has no content");
	
   // Each element is accessed via the iterator.
   Iterator<DeliveryHouseDetails> iterator = inputLines.iterator();
	
    // Then writes to the desired output file.
    while (iterator.hasNext())
      out.println(iterator.next().getPersonName());

    // Exit and close all readers and writers.
    in.close();
    out.close();
  } // try
  
  // Catch the exceptions.
  catch (ArrayIndexOutOfBoundsException exception)
  { 
   System.out.println("Please supply only 2 arguments, "
	                  + "inputFilename outputFilename.");   
  } // catch
 
 catch (FileNotFoundException exception)
 {   
   System.out.println("Input file not found - please check that it exists.");
 } // catch
 
 catch (IOException exception)
 { 
   System.out.println("Please supply only 2 arguments, "
	                  + "inputFilename outputFilename.");  
 } // catch
 
 catch (Exception exception)
 { 
   System.out.println("This file has no content.");  
 } // catch
      
  } // main
} // class StreetOrder