loading objects into arraylist

[rames tirrupur]

Hi All,

I have a scenario where i need to add objects to arraylist based on some condition.

eg: After firing sql, i get the results with duplicate customer number.
I want to add the same customer numbers to one arraylist and add the different customer number to other arraylist. and finally add both the arraylist to hashmap.

How to do this?

Thanks,
rames

[Christophe Verré]

This is basic java, not servlet related. Please post to the correct forum next time

You know the HashMap class ?
You use put() and get(), then you can solve your problem.

[Bear Bibeault]

Moved to java in General (beginner).

[Richard Green]

what do you mean by "same" customer number and "different" cutsomer number?

If by "same" you mean "unique" and by "different" you mean "duplicate" customer numbers., then the following code should achieve what you want.

List<String> unique = new ArrayList<String>();
List<String> duplicate = new ArrayList<String>();
 
while(resultSet.hasNext()){
   String customerId = resultSet.getString("customerId");
   if (unique.contains(customerId)){
     unique.remove(customerId);
     duplicate.add(customerId); 
   } else {
     unique.add(customerId);
   }
}
Map ret = new HashMap<List<String>,List<String>>();
ret.put("unique",unique);
ret.put("duplicate",duplicate);
return ret

[ July 27, 2006: Message edited by: Lynette Dawson ]

[Stan James]

See if this answers the right question. This will make a map with key=customer number and value=a bunch of rows.

for each row of result set
   customerNumber = row getCustomerNumber
   rowsForOneCustomer = map get customerNumber 
   if no rows found in map
      rowsForOneCustomer = new list
      map put customerNumber, rowsForOneCustomer 
   rowsForOneCustomer add row 
next

Is that close?