Bind jCombobox Java

Bind jComboBox

public class KeyValue {

    private Object key;

    private String value;

    KeyValue () {

    }

    KeyValue (Object key, String value) {

        this.key=key;

        this.value=value;

    }

    public Object getKey() {

        return this.key;

    }

    public void setKey(Object key) {

        this.key=key;

    }

    public String getValue() {

        return this.value;

    }

    public void setValue(String value) {

        this.value=value;

    }

    @Override

    public String toString() {

        return this.value;

    }

}

    public void  bindComboBox()

    {

      Connection connection;

        try {

             MainClass mc=new MainClass();

            connection=DriverManager.getConnection(mc.StrUrl,mc.StrUid,mc.StrPwd);

            ResultSet rs;

            PreparedStatement stmt=connection.prepareStatement("select Id, user_name, user_password, user_type from lib_user");

            rs = stmt.executeQuery();

            while(rs.next()){

                    String name =rs.getString("user_name");

                    String Id=rs.getString("Id");

                   // jComboBox1.addItem(name);

                   

                    jComboBox1.addItem(new KeyValue(rs.getString("Id"),rs.getString("user_name")));

                   // jComboBox1.setPrototypeDisplayValue("user_name");

                   // jComboBox1.getSelectedItem().toString());

            }

             

        } catch (Exception e) {

            System.err.println(e);

            //System.exit(1);

        }

         finally {

      

        }

    }