How to find the values from List based on another id ?

You can only extract the details you need out of a query that has been done using a join. From that you need to build a List of beans that itself encapsulates a Collection

In my result set i have all the values , but when displaying i need to display one productcode with multiple itemscode.

Example :
productcode : 102
itemcode : 12 , 41 , 52 , 63

These four itemcode associated with productcode 102. These values are same row in the database . I have 1000's of productcode with multiple item codes.When displaying productcode need to display itemcode as well.

Expected output :
product code : 102
itemcode : 12,41,52,63

productcode : 105
itemcode : 11 ,78 , 1 ,7 ,9 ,20

like above...

You're saying the ResultSet comes out like

102,12,41,52,63

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and not like

102,12
102,41
102,52
102,63

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?

Please find below SQL return values :

product   itemcode  Desc
6799        8205        OR
6799        8206        OR
6799        8208        OR
6799        8422        OR
6799        8424        OR
6799        1381        OR
6799        1485        OR
6799        1563        OR

Expected output :
8205 OR 8206 OR 8208 OR8422 OR as like

OK. I would

a. Make a Product bean
b. Make an ItemInfo bean with attributes of at least 'code' and 'description'
c. Give Product a List<ItemInfo>
d. Give it an addItemInfo method
e. Create a Set<Product>

The algo should go something like

a. read the row
b. if Product(id) not in the Set<Product>, create it, else get() it
c. For the rest of the row call

product.addItemInfo(new ItemInfo(rs.getString("itemcode"), rs.getString("description")));

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Yes, your correct.

using below code , i can able to get all the values.
Iterator<SearchResult> iterator = partitems.iterator();
while(iterator.hasNext())
{
SearchResult Sr = (SearchResult)iterator.next();
sr.getprdcode());            
sr.getitecode();
//how to merge the two fields values in single row as like column3  ?
}


column1   column2    column3  
6799         item1         8205 OR 8206 OR 8208 OR8422
6799         item2         8205 OR 8206 OR 8208 OR8422
6799         item3         8205 OR 8206 OR 8208 OR8422
6799         item4         8205 OR 8206 OR 8208 OR8422
6799         item5         8205 OR 8206 OR 8208 OR8422

Sorry - i'm confused - you seem to have repeated the question, which i've answered ...

Iterator<Search> iterator = products.iterator();
MultiHashMap lists = new MultiHashMap();
StringBuilder sb = new StringBuilder();
List list = null;

while(iterator.hasNext())
{
    Search req = (Search)iterator.next();
    String product = req.getProduct();
    sb.append(req.getpartitem()); //appending multiple items in the string
    sb.append(" ");
    sb.append(req.getdesc()));
    sb.append(" ");
    lists.put(product, sb.toString());
   sb.setlength(0);
    req.getProduct();
    req.getDescr();
    req.getreqspartno();
    req.getreqproddescr();          
}

Set set = dependencies.entrySet();
Iterator i = set.iterator();

while(i.hasNext())
{
     Map.Entry me = (Map.Entry)i.next();
     list=(List)lists.get(me.getKey());
     for(int j=0;j<list.size();j++)
     {
        list.get(j).toString()));
     }
}

How to split the values ?

Good