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How to set combobox value from database in java

public ArrayList<Clazz> getArrayListLop() {
 ArrayList<Clazz> list = new ArrayList();
 try {
 stmt = conn.prepareStatement("SELECT * FROM project.lop");
 rs = stmt.executeQuery();
 while (rs.next()) {
 Clazz clazz = new Clazz(rs.getString("idlop"), rs.getString("lop"), rs.getString("idkhoa"),
 rs.getString("khoahoc"));
 list.add(clazz);
 // Display comboBox set from databse
 comboBox_lop.addItem(rs.getString("lop"));
 }
 
 } catch (Exception e) {
 e.printStackTrace();
 }

 return list;
}

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