isClosed()
Syntax:
boolean isClosed()
                 throws SQLException
                                        Description:
Retrieves whether this ResultSet object has been closed. A ResultSet is closed if the method close has been called on it, or if it is automatically closed.
Returns:
true if this ResultSet object is closed; false if it is still open
Throws:
SQLException - if a database access error occurs or this method is called on a closed result set
Reference:
For more information, reference JDBC documentation for: ResultSet.isClosed()