I'm using Netbeans and derby(the database in Netbeans), and I got this error. If I change the 0 to null, there won't be any data displayed on the table. I want the system to check whether the form is empty or not.

set bad operand types for binary operator'!= // Call method to first type: String number X then return the second type int reservation = manag eld.getText().trim())); (Alt-Enter shows hints) if(reservation.getReservationIDO. L- -oh w call methods at class Item to get the searched attributes valu W and display to the form 10txtField.setText (reservation.getReservationID()); nameTxtField.setText (reservation.getReservationName())