need help on reset/clear jcombobox values

im using below coding to add values to a jcombobox using another jcombobox and i need to add the values to the jcombobox2 according to the one get selected in the jcombobox1 without appending values so can someone tell me a way to reset or clear the combo-box values when another option selected? below is my coding and i'm new to java and netbeans so if someone can help i'll be grateful :) ``` Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection con = DriverManager.getConnection("jdbc:mysql://localhost/database1", "root", "senura123"); Statement stat = (Statement) con.createStatement(); String val=jComboBox1.getSelectedItem().toString(); String check; String col; if ("Vehicles".equals(val)){ check = "select reg_no from vehicle;"; col="reg_no"; } else if ("Travel Guides".equals(val)){ check = "select username from travelguide;"; col="username"; } else{ check = "select username from transportofficer"; col="username"; } ResultSet rslt = stat.executeQuery(check); while (rslt.next()) { jComboBox2.addItem(rslt.getString(col)); } } ```