Question

I have a list say its has 25 rows. My page count will be always 5 and i ll be passing the pageId to the list so that i can get only those 5 rows which belongs to that page id (say if my pageId is 2 i need rows from 6-10).. Any simple method to do this???

List<Employee> empList= (List<Employee>)employeeHelper.fetchallData();

This emplist will have all the rows.

Answer 1

I am not sure I understand, but it seems you are looking for a sublist of emplist.

You can use the method List.subList(int fromIndex, int toIndex) for it.

From the javadocs:

Returns a view of the portion of this list between the specified
fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and
toIndex are equal, the returned list is empty.) The returned list is
backed by this list, so non-structural changes in the returned list
are reflected in this list, and vice-versa. The returned list supports
all of the optional list operations supported by this list.

This method eliminates the need for explicit range operations (of the
sort that commonly exist for arrays). Any operation that expects a
list can be used as a range operation by passing a subList view
instead of a whole list.

To get the elements 5-10 (inclusive, count start at 1) in the 2nd doc:
emplist.subList(25 * (2-1) + (5-1), 25 * (2-1) + 10)