Hi
i have 2 tables
customer (cabinet_num which is integer)
and cabinet (cabinet_num Autoincrement and cabinet_title)
in my java i can display cabinet title to let the user choose a cabinet..but i want to collect the cainet_number in my customer table
customet.cabinet

package cabinet;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import java.awt.Font;
import java.awt.Color;
import javax.swing.UIManager;
import javax.swing.JLabel;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.ScrollPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.awt.ComponentOrientation;
import javax.swing.ScrollPaneConstants;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.JOptionPane;
import javax.swing.JScrollBar;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import java.awt.Button;
import java.awt.event.ActionEvent;

public class cabinet extends JFrame {


    private JPanel contentPane;
    private JTextField txtCustomerInformation;
    private JTextField custnum;
    private JTextField name;
    private JTextField shop;
    private JScrollPane scrollPane;
    private JScrollPane scrollPane_1;
    private JTextArea address;
    private JTextField person1;
    private JLabel phone;
    private JTextField person3;
    private JLabel lblCabinetNo;
    private JLabel pers1;
    private JLabel pers2;
    private JTextField person2;
    private JComboBox jc;
    private JButton ajouter;
    private JButton update;
    private JButton effacer;
    private JButton quitter;

    /**
     * Launch the application.
     * @throws ClassNotFoundException 
     * @throws SQLException 
     */



    public cabinet() throws ClassNotFoundException, SQLException  {
        display(); 
        connecte();


    }
    **public void connecte() throws ClassNotFoundException, SQLException{
        Connection conn = null;
        //int jcn;
        try {
                // The driver allows you to query the database with Java
                // forName dynamically loads the class for you

                Class.forName("com.mysql.jdbc.Driver");

                // DriverManager is used to handle a set of JDBC drivers
                // getConnection establishes a connection to the database
                // You must also pass the userid and password for the database

                conn = DriverManager.getConnection("jdbc:mysql://localhost/cabinet","root","root");

                // Statement objects executes a SQL query
                // createStatement returns a Statement object

                Statement sqlState = conn.createStatement();

                // This is the query I'm sending to the database

                String selectStuff = "Select cabinet_num,cabinet_type from cabinet";

                // A ResultSet contains a table of data representing the
                // results of the query. It can not be changed and can 
                // only be read in one direction

                ResultSet rows = sqlState.executeQuery(selectStuff);

                // next is used to iterate through the results of a query
                while(rows.next()){
                    String res = rows.getString("cabinet_type");

                    if (res != null) {
                        res = res.trim();
                    }
                    jc.addItem(res);

                }
        }   
catch (SQLException ex) {

            // String describing the error

            System.out.println("SQLException: " + ex.getMessage());

            // Vendor specific error code

            System.out.println("VendorError: " + ex.getErrorCode());
        } 

        catch (ClassNotFoundException e) {
            // Executes if the driver can't be found
            e.printStackTrace();
        } 
    }       
         **

    public void display(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 809, 447);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);



        txtCustomerInformation = new JTextField();
        txtCustomerInformation.setEditable(false);
        txtCustomerInformation.setBounds(5, 5, 798, 40);
        txtCustomerInformation.setBackground(UIManager.getColor("Button.shadow"));
        txtCustomerInformation.setForeground(UIManager.getColor("OptionPane.errorDialog.titlePane.background"));
        txtCustomerInformation.setFont(new Font("Times New Roman", Font.BOLD, 30));
        txtCustomerInformation.setHorizontalAlignment(SwingConstants.CENTER);
        txtCustomerInformation.setText("CUSTOMER INFORMATION");
        contentPane.add(txtCustomerInformation);
        txtCustomerInformation.setColumns(10);

        JLabel cust = new JLabel("Customer No");
        cust.setFont(new Font("Arial", Font.BOLD, 12));
        cust.setBounds(5, 57, 104, 15);
        contentPane.add(cust);

        custnum = new JTextField();
        custnum.setBounds(127, 57, 114, 19);
        contentPane.add(custnum);
        custnum.setColumns(10);

        JLabel nom = new JLabel("Trading Name");
        nom.setFont(new Font("Arial", Font.BOLD, 12));
        nom.setBounds(5, 90, 104, 15);
        contentPane.add(nom);

        name = new JTextField();
        name.setBounds(127, 88, 272, 19);
        contentPane.add(name);
        name.setColumns(10);

        JLabel shope = new JLabel("Over Shop");
        shope.setFont(new Font("Arial", Font.BOLD, 12));
        shope.setBounds(5, 117, 104, 15);
        contentPane.add(shope);

        shop = new JTextField();
        shop.setBounds(127, 119, 114, 19);
        contentPane.add(shop);
        shop.setColumns(10);

        JLabel add = new JLabel("Full Trading Address");
        add.setFont(new Font("Arial", Font.BOLD, 12));
        add.setBounds(5, 144, 125, 15);
        contentPane.add(add);

        scrollPane_1 = new JScrollPane();
        scrollPane_1.setBounds(130, 150, 183, 81);
        contentPane.add(scrollPane_1);

        address = new JTextArea();
        scrollPane_1.setViewportView(address);
        address.setLineWrap(true);

        person1 = new JTextField();
        person1.setBounds(127, 243, 196, 19);
        contentPane.add(person1);
        person1.setColumns(10);

        phone = new JLabel("Phone No");
        phone.setFont(new Font("Arial", Font.BOLD, 12));
        phone.setBounds(5, 307, 70, 15);
        contentPane.add(phone);

        person3 = new JTextField();
        person3.setColumns(10);
        person3.setBounds(127, 304, 196, 19);
        contentPane.add(person3);

        lblCabinetNo = new JLabel("Cabinet Requested");
        lblCabinetNo.setFont(new Font("Arial", Font.BOLD, 12));
        lblCabinetNo.setBounds(332, 57, 114, 19);
        contentPane.add(lblCabinetNo);

        pers1 = new JLabel("Contact Person 1");
        pers1.setFont(new Font("Arial", Font.BOLD, 12));
        pers1.setBounds(5, 247, 104, 15);
        contentPane.add(pers1);

        pers2 = new JLabel("Contact Person 2");
        pers2.setFont(new Font("Arial", Font.BOLD, 12));
        pers2.setBounds(5, 277, 104, 15);
        contentPane.add(pers2);

        person2 = new JTextField();
        person2.setColumns(10);
        person2.setBounds(127, 274, 196, 19);
        contentPane.add(person2);
          jc = new JComboBox<String>();
          jc.setBounds(479, 57, 295, 24);
          contentPane.add(jc);

          ajouter = new JButton("Add");
          ajouter.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                Connection conn = null;
                try {
                    Class.forName("com.mysql.jdbc.Driver");
                } catch (ClassNotFoundException e2) {
                    // TODO Auto-generated catch block
                    e2.printStackTrace();
                }

                // DriverManager is used to handle a set of JDBC drivers
                // getConnection establishes a connection to the database
                // You must also pass the userid and password for the database

                try {
                    conn = DriverManager.getConnection("jdbc:mysql://localhost/cabinet","root","root");
                } catch (SQLException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
                String cust,nom,boutique,addr,pers1,pers2,phone = null;
                int num = 0;
                cust=custnum.getText();
                nom=name.getText();
                boutique=shop.getText();
                addr=address.getText();
                pers1=person1.getText();
                pers2=person2.getText();
                phone=person3.getText(); 
                //num=(Integer) jc.getSelectedItem();

                try
                {                
                    //Connection con = connecte();          
                    String strQuery = "INSERT INTO customer(custnum,tradingname,overshop,address,contact1,contact2," +
                            "phone) VALUES (?,?,?,?,?,?,?)";
                    java.sql.PreparedStatement statement = conn.prepareStatement(strQuery);
                    statement.setString(1,cust);
                    statement.setString(2,nom);
                    statement.setString(3,boutique);
                    statement.setString(4,addr);
                    statement.setString(5,pers1); 
                    statement.setString(6,pers2);
                    statement.setString(7,phone);
                    //statement.setLong(8,num);

                    statement.executeUpdate();
                 JOptionPane.showMessageDialog(null,"Record Added to customer table");
                }
                catch(Exception e)
                {
                    JOptionPane.showMessageDialog(null,"Exception: "+ e.toString());
                }


            }
          });
          ajouter.setBounds(26, 348, 104, 40);
          contentPane.add(ajouter);

          update = new JButton("Update");
          update.setBounds(153, 348, 104, 40);
          contentPane.add(update);

          effacer = new JButton("Delete");
          effacer.setBounds(274, 348, 104, 40);
          contentPane.add(effacer);

          quitter = new JButton("Exit");
          quitter.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                System.exit(0);
            }
          });
          quitter.setBounds(395, 348, 104, 40);
          contentPane.add(quitter);

        JTextArea ta = new JTextArea();
        JScrollPane sp = new JScrollPane(ta);
        JFrame f = new JFrame();
        f.getContentPane().add(sp);
    }
    public static void main(String[] args) throws ClassNotFoundException, SQLException {


        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    cabinet frame = new cabinet();

                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

_num=cabinet.cabinet_num

Can I confirm what you are asking?
You have some Cabinets, each with a number and a title. You want to display the title in the GUI, but get the number when the user has made his selection. Is that right?
Are all the titles unique?

Hi
the table has number and title
1-wood
2-plastic
3-iron and so
i want to collect the number (1 ou 2 ou any other number)..to put it on custumer table who has a field called cabinet_number and it is int
thank you very much

another of reasons to post an SSCCE, short, runnable, compilable with hardcoded value in local variable for JTable/XxxTableModel instead of shadowing JDBC

i want to show
**` String selectStuff = "Select cabinet_num,cabinet_type from cabinet";

// A ResultSet contains a table of data representing the
// results of the query. It can not be changed and can
// only be read in one direction
ResultSet rows = sqlState.executeQuery(selectStuff);
// next is used to iterate through the results of a query
while(rows.next()){
String res = rows.getString("cabinet_type");
int num=rows.getString("cabinet_num");///the error is here
if (res != null) {
res = res.trim();
}
jc.addItem(res);`**

i want for my selectedvalue() to be a number not the title ...
int x
x=getselectedvalue(number);is this what i need to do

OK. Exacatly how do you want to display the cabinets in the combo box? Give an example.

again short, runnable, compilable with hardcoded value in local variable for JTable/XxxTableModel instead of shadowing JDBC

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