Iterate through two lists

Question

Hello,
I'm writing an application that generates two seperate sets of data from a database which are stored in two lists; list A & B. I need to cycle through one list (*B*) and remove data according to my search criteria. When I encounter data that I'm going to remove, it has to be done on list A as well.
Is it at all possible to use one iterator to cycle through list B and modify A at the same time? If so, please explain.

Answer 1

For those who are interested, here is the code I used to solve the problem. All the writers create an html booklet for easy interpretation. And yes, I did take into consideration the fact that removing an item from the list offsets the counter and will skip n+1. The use of while( cdList.contains( trimmedcdValue )) was introduced to handle such a case by continuing to delete duplicates (by grabbing their subscript) within the list.
          try{
               statWriter=new BufferedWriter(new FileWriter("results/"+directory+"/FileStatistics.html"));
               statWriter.write(this.buildHeader("File Statistics"));
               statWriter.write("<table class='file-stats'><tr><th>File #</th><th>File name</th><th>Lines read</th><th>Total matches</th></tr>");
               writer=new BufferedWriter(new FileWriter("./results/"+directory+"/MatchList.html"));               
               writer.write(this.buildHeader("Matched References"));
               writer.write("<table><tr><th>File Line</th><th>CD Reference</th><th>ATA Number</th><th>Log_Book</th><th>Description</th><th>File Found in</th></tr>");
               //loop through all new files
               for(int y=0; y<f.length; y++){
                         //update the progressbar information
                    this.updateProgress(f[y]);
                    //set file reader
                    reader=new BufferedReader(new FileReader("./id files/"+directory+"/"+f[y]));
                    int lineCount=0;     //keep track of lines read
                    int match=0;          //keep track of the matches
                    String line=null;
                    while((line=reader.readLine())!=null){
                         String trimmedLine=line.trim();          //remove leading/trailing whitespace
                         lineCount++;                              //increment line counter
                              //cycle through list and check for matches
                         for(int x=0; x<cdList.size();x++){
                              String cdValue=(String)cdList.get(x);               //current list subscript
                                   //remove leading/trailing whitespace
                              String trimmedcdValue=cdValue.trim();                    
                                   //if matched; remove row from list
                              if(trimmedLine.equalsIgnoreCase(trimmedcdValue)){     
                                        //while the value exists in the list; find & remove
                                   while(cdList.contains(trimmedcdValue)){
                                        match++;
                                        row=(match%2==0)?"<tr>":"<tr class='shaded'>";
                                        int index=cdList.indexOf(trimmedcdValue);
                                        writer.write(row+"<td>"+trimmedLine+"</td><td>"+cdList.get(index)+"</td><td>"+ataList.get(index)+"</td><td>"+logList.get(index)+"</td><td>"+descList.get(index)+"</td><td>"+f[y].toLowerCase()+"</td></tr>");
                                        this.removeRow(index);
                         }//end list for-loop
                    }//end line read while-loop
                    writer.flush();                    //flush writeMatch buffer
                         //write file statistics
                    row=(y%2==0)?"<tr>":"<tr class='shaded'>";
                    statWriter.write(row+"<td>"+(y+1)+" of "+f.length+"</td><td>"+f[y].toString()+"</td><td>"+lineCount+"</td><td>"+match+"</td></tr>");
               }//end file for-loop
               writer.write("</table></body></html>");
               writer.close();          //close write match stream
                    //reopen write stream for new file
               writer=new BufferedWriter(new FileWriter("./results/"+directory+"/RemainingList.html"));
               writer.write(this.buildHeader("Remaining List"));
               writer.write("<table><tr><th>CD Reference</th><th>ATA Number</th><th>Log Book</th><th>Description</th></tr>");
               for(int y=0; y<cdList.size(); y++){
                    row=(y%2==0)?"<tr>":"<tr class='shaded'>";
                    writer.write(row+"<td>"+cdList.get(y)+"</td><td>"+ataList.get(y)+"</td><td>"+logList.get(y)+"</td><td>"+descList.get(y)+"</td></tr>");
               writer.write("<tr><td colspan='4'>Remaining list size: "+cdList.size()+"</td></tr></table></body></html>");
               writer.flush();                    //flush writeList Stream
               writer.close();                    //close     writeList stream
                    //display operation statistics
               endingListSize=cdList.size();
               statWriter.write("<tr><td colspan='2'>Beginning list size:</td><td colspan='2'><strong>"+beginningListSize+"</strong></td></tr>");
               statWriter.write("<tr class='shaded'><td colspan='2'>Null CD References removed:</td><td colspan='2'><strong>"+nulls+"</strong></td></tr>");
               statWriter.write("<tr><td colspan='2'>ENG Log values removed:</td><td colspan='2'><strong>"+engs+"</strong></td></tr>");
               statWriter.write("<tr class='shaded'><td colspan='2'>Ending list size:</td><td colspan='2'><strong>"+endingListSize+"</strong></td></tr>");
               statWriter.write("</table></body></html>");
                    //flush and close stat writer stream
               statWriter.flush();
               statWriter.close();
          }catch(IOException ioe){
               ioe.printStackTrace();
          }     If you care to actually look through all this code, there is a call to removeRow which deletes the selected item from each list and is as follows...
     private void removeRow(int x){
               //remove identical row for each column
          cdList.remove(x);
          ataList.remove(x);
          logList.remove(x);
          descList.remove(x);
     }Thanks to everyone who invested time in this problem, but fortunately enough the problem was solved outside of this forum.