If else question.

Question

Hello,
public void register() throws SQLException{
     try {
        databaseConnection();
        PreparedStatement ps = con.prepareStatement("INSERT INTO reservation(ci,co,roomno,numb,roomty,nm,srn,phn,mail,sex)" +
                "VALUES (?,?,?,?,?,?,?,?,?,?)");
                ps.setString(1,ci);
                ps.setString(2, co);
                ps.setInt(3, roomno);
                ps.setString(6, nm);
                ps.setString(5, roomty);
                ps.setString(10, sex);
                ps.setString(8, phn);
                ps.setString(9, mail);
                ps.setString(4, numb);
                ps.setString(7, srn);
                ps.executeUpdate();
                JOptionPane.showMessageDialog(null,"Completed");
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null," PLsss....");
    finally{
                    con.close();
                    stm.close();
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                        
// TODO add your handling code here:
     String ent=jTextField3.getText();
     String out=jTextField4.getText();
     String name=jTextField5.getText();
     String surn=jTextField8.getText();
     String phn=jTextField6.getText();
     String mail=jTextField7.getText();
    if(name.isEmpty() && surn.isEmpty() && phn.isEmpty() && mail.isEmpty() && ent.isEmpty() && out.isEmpty()){
        JOptionPane.showMessageDialog(null,"Fill it..");
      else {
            try {
                register();
                new Check_IN();
            } catch (SQLException ex) {
                Logger.getLogger(Check_IN.class.getName()).log(Level.SEVERE, null, ex);
}Here the fields are empty however register() is done. I use AND as logical operator but it behaves like OR. even one is filled then pass the register(). moreover in register method all fields should me filled otherwise throw message but it is done without any problem.
and at the and of register() I like to back to page with "new Check_IN();" I can t do it either.
how register() is run without complete if condition ?

Answer 1

hibrahimdogru wrote:
Thank you jverd
how about "new Check_In();"
I like to back to page after complete register() why it doens t open the page again?What about Check_In()? We know nothing about that class.
How would we know about why it doesn't "open the page again" based on the code you posted so far?
>
and I was expect error with register(), how the values pass as null in preparedstatement ? why it doens t throw nullpointerexception ?They aren't null, they are such that the isEmpty() method returned true, so it is dealing with the String value "", not null.
Edit: Actually I'm not sure what the values of the variables in that method are, because you also have a scoping issue. One method declares those variables and sets them, and then you're invoking another method without passing them to it. So I guess you have class variables and it is using those instead.
This code is a complete mess.