Grouping Data with JSP or JSTL

Question

Hi All,
I would like to ask a question about how I can group data in JSP. Essentially, I have a DataBean (extends ArrayList) that is being returned to my JSP. The ArrayList contains HashTables. Please note that the JSP assumes the data is returned in sorted order. This JSP is not responsible for sorting the data itself.
[UPDATED EXAMPLE]
For example, here is what the data might look like:
Column A Column B Column C
1 2 3
1 15 20
4 5 6
4 99 66
7 8 9
10 11 12
Here is how I would use my DataBean:
String column1Name =bundle.getString(�columnA.title�);
String column2Name =bundle.getString("columnB.title");
String column3Name =bundle.getString("columnC.title");
/* Loop through the bean. */
for (int i=1;i<myDataBean.size();i++) {
Hashtable reportRow=myDataBean.get(i);
String column1Value=reportRow.get(Constants.COLUMNA);
String column2Value=reportRow.get(Constants.COLUMNB);
String column3Value=reportRow.get(Constants.COLUMNC);
}Question
If I want to change my layout/display to group by a particular column. How would I do that without changing the data structure that is running my current DataBean? Below is an example of grouping by the values in ColumnA.
ColumnA: 1
ColumnB ColumnC
2 3
15 20
ColumnA: 4
ColumnB ColumnC
5 6
99 66
ColumnA: 7
ColumnB ColumnC
8 9
ColumnA: 10
ColumnB ColumnC
11 12
Your help is very much appreciated.
Thanks!

Answer 1

Just curious, do people find my question unclear? Can I help clarify any points?