The ResultSet class is not very convenient to use

Question

Often we need to know how many rows have been retrieved from the database before we read each row's data in order to do preparation works such as allocate appropriate memories to store the data.The ResultSet class in java.sql package does not provide a function to retrieve the total rows read from the database. We must do the follow to get the count of rows:
ResultSet rs;
rs.last();
int lastrow = rs.getRow();
rs.first();
int firstrow = rs.getRow();
int rows = lastrow - firstrow + 1;
String [] data = new String[rows];
// retrieve each row's data into the string array
It would be much more convenient if the class can provide a function like:
rs.getRows();

Answer 1

Often we need to know how many rows have been
retrieved from the database before we read each row's
data in order to do preparation works such as allocate
appropriate memories to store the data.But then we learn a little bit of Java and realize we can add the rows to a List (such as an ArrayList) without having to know that number in advance.