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How to Convert an ArrayList into Collection

Posted on 2004-09-02
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Last Modified: 2012-06-27
How can i convert an ArrayList to Collection?

With Struts, I have an ArrayList of members in my Action Class and i want it to convert to Collection so that i can use it in <html:optionsCollections>
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Question by:ldbkutty
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9 Comments
 
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Accepted Solution

by:
CEHJ earned 350 total points
ID: 11968351
An ArrayList *is* a Collection
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Author Comment

by:ldbkutty
ID: 11968446
well, i dont have a chance to check with my Struts now, but when i tried ArrayList in <html:optionsCollections ...>, it didn't worked.

Probably, my mistake somewhere?
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LVL 86

Expert Comment

by:CEHJ
ID: 11968475
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LVL 92

Expert Comment

by:objects
ID: 11968890
what error are you getting, and can you post your tag
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Assisted Solution

by:objects
objects earned 100 total points
ID: 11969677
the following should help you locate your problem:

http://www.webappbuilders.com/?content=html-optionscollection

Let me know if you have any questions.
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LVL 3

Assisted Solution

by:vikraman_b
vikraman_b earned 50 total points
ID: 11970003
Hi ,
Just clear with the syntax.....
ArrayList itself a collection.... just check this..
yourjsp
--------
<html:select property="country" onChange="countryChange(createLoginAccForm)">
          <html:options  collection="countryList" property="value" labelProperty="label" />
        </html:select>

yourAction class
----------------
ArrayList arrayListL = (ArrayList) yourDAO.loadCountryList();


yourDAO class
-----------
public ArrayList loadCountryList() throws NamingException, SQLException {
            String countryCodeSQL = "select objid,country_cd ,country_name from country";

            ArrayList arrayList = new ArrayList();
            Connection conn = null;
            Statement stmt = null;
            ResultSet rs = null;

            String countryCode = null;
            String countryName = null;
            logger.debug("countryCodeSQL query:" + countryCodeSQL);

            try {
                  conn = DBUtils.getInstance().getConnection();
                  stmt = conn.createStatement();

                  stmt.execute(countryCodeSQL);
                  rs = stmt.getResultSet();

                  while (rs.next()) {
                        int objid = rs.getInt(1);
                        countryCode = rs.getString(2);
                        countryName = rs.getString(3);

                        arrayList.add(new KeyValueBean(objid, countryName));

                  }

            } catch (SQLException e) {
                  throw e;
            } finally {
                  try {
                        if (rs != null)
                              rs.close();
                  } catch (Exception e) {
                  }
                  try {
                        if (stmt != null)
                              stmt.close();
                  } catch (Exception e) {
                  }
                  try {
                        if (conn != null)
                              conn.close();
                  } catch (Exception e) {
                  }
            }
            return arrayList;
      }

Hope this will help
Regards
VIkraman
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Author Comment

by:ldbkutty
ID: 11975569
thanks for all, but CEHJ gets the most. :-)
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LVL 86

Expert Comment

by:CEHJ
ID: 11975619
8-)
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LVL 86

Expert Comment

by:CEHJ
ID: 11975621
8-)
0

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