Java paging calculation formula

1 Calculate based on the incoming parameters

1.1 Request parameters ( currPage : current page, pageSize : number of displayed items per page), calculate the starting number and ending number of items according to these two parameters

• Starting number

firstIndex = (currPage-1) * pageSize

• Deadline number

lastIndex = currPage * pageSize

1.2 Calculate the total page number (to get the total number)

pages = total%pageSize == 0 ? total/pageSize: total/pageSize + 1