adding items in jcombobox

[Norgy]

    private void pnosActionPerformed(java.awt.event.ActionEvent evt) {
  
       try { 
             Class.forName("com.mysql.jdbc.Driver");
            try (Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/depatment", "root","riham00879")) {
                Statement statement = connection.createStatement();
                String query = "SELECT * FROM protocol";
                ResultSet rs = statement.executeQuery(query);

                while (rs.next())
                {      
                   String pno = rs.getString("pno");         
                  pnos.addItem("pno");
                      System.out.println(pno);
                }
            }
             } catch (ClassNotFoundException | SQLException e) {
             }
       
    }

i am trying to get data from MySQL database and print it in the jcombobox but nothing is printed
what is the problem ??

[Nepomuk]

I'm no expert in the MySQL stuff but I see you're using System.out.prin tln(pno); is this how you're trying to set the contents of the jcombobox? Because that won't work; that will only print the value of pno to the standard output, which is probably a console. What you want to use is JComboBox.addIt em(...) to add something to the JComboBox.

[Norgy]

i tried to write -> pnos.addItem(pn o);
and removed the line of System.out.prin tln
but the problem hasn't resolved yet