I wrote paging logic:

My requirement: total elements to display:100 per page,if i click next it should display next 100 records,if i click previous 100 records.

Initial varaible values:

• showFrom:1,
• showTo:100
• max elements:depends on size of data.
• pageSize:100.

Code:

if(p*emphasized text*aging.getAction().equalsIgnoreCase("Next")){
  paging.setTotalRec(availableList.size());
  showFrom = (showTo + 1);
  showTo = showFrom + 100- 1;
  if(showTo >= paging.getTotalRec())
    showTo = paging.getTotalRec();
  paging.setShowFrom(showFrom);
  paging.setShowTo(showTo);
}

else if(paging.getAction().equalsIgnoreCase("Previous")){
  showTo = showFrom - 1;
  showFrom = (showFrom - 100);
  paging.setShowTo(showTo);
  paging.setShowFrom(showFrom);
  paging.setTotalRec(availableList.size());
}

Here i can remove and add the elements to the existing data.above code works fine if i add and remove few elements.but if i remove or add 100 elements at a time counts are not displaying properly above code works fine if i add and remove few elements.