Java List question

Question

Dear all,
My development tool is JDev. 10.1.3.
I've a session bean which the list contains several fields. The list defined like this:
List<cell> List1 = new ArrayList(); cell in a cell.java.
I created List2, List<cell> List2 = new ArrayList(); which the list contents are copied from List1.
On the jspx, List1 is on the left hand side, it rendered out as a table, user can select the row and click the button "Add item to List2". On the right hand side, List2 allows user input information. User can choose List1 item to List2 repeatly.
The question is, e.g. List1 and List2 contain A and B items initially. User inputted information in List2 for A item. And then, choose A item from List1 to List2 again. The new selected item carried the information that user input in List2 before.... I don't know why?
Then, I modified the List2 like this: List<dupcell> List2 = new ArrayList(); and hope the information will not be carried.
However, it doesn't work..
Can anyone help me? Please.
Thanks for any suggeston!
Regards.

Answer 1

Sorry, my English is not good...
my situation like this:
"List1" defined in a session bean, "shoppingCart.java", like this:
List<cell> List1 = new ArrayList();
In the cell.java code, like this:
public class cell {
private String id;
private String type;
private Number quantity;
private String remarks;
public cell() {}
public cell(Number id) {
this.Id = id;
/** defined getter and setter **/
In a JSF page1, user selected the id and id will be stored in the session bean. e.g. user selected id "A" and "B".
Then, user click a button and go to JSF page2.
This button call a function, the List1 copy to List2, like this:
public String copy_to_new(){
List2.addAll(Utils.getShoppingCart().getList1());
return "page2"; //go to JSF page2
Two lists were created.
List1 - user select item, move the item to List2.
List2 - user input the information: type, quantity and remarks. e.g. user inputted information for id "A": type = "small", quantity = 1, remarks = "urgent".
Now, user click id "A" from List1 to List2.
On List2, it shows:
Id Type Quantity Remarks
A small 1 urgent
B
A small 1 urgent <-- new selected row (I don't want this)
Question: How can I create a new row that it does not carry the previous information, like this:
Id Type Quantity Remarks
A small 1 urgent
B
A <-- new selected row
Thank you very much for any helps!!
Regards.