Auto Refresh JComboBox on button click.


private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        try
        {
           Class.forName("com.mysql.jdbc.Driver");
            java.sql.Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3305/rms","root","root");
            PreparedStatement pst=(PreparedStatement) con.prepareStatement("insert into categories(name) values(?)");
            pst.setString(1,jTextField8.getText());
             pst.executeUpdate();
             con.close();
             pst.close();
             jTextField8.setText("");
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        fill();
    }


public void fill()
{
    DefaultComboBoxModel model = new DefaultComboBoxModel();
     try
        {
    Class.forName("com.mysql.jdbc.Driver");
    java.sql.Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3305/rms","root","root");
    String sql="select name from categories";
    java.sql.PreparedStatement pst=con.prepareStatement(sql);
  
    ResultSet rs = pst.executeQuery(sql);
  
  while(rs.next())
  {
   String name=rs.getString(1);
   model.addElement(name);
  }
  jComboBox1.setModel(model);
con.close();
pst.close();
        }
        catch(Exception e)
        {
            JOptionPane.showMessageDialog(null, e);
        }
}         

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