JComboBox作为搜索字段

Question

我首先引用this并像这样编辑..同名组合框名称。但是当我调用此方法时，它要求keyEvent..for我应该怎么做。这个代码是否有任何错误< / p>

ResultSet rset;
public void srKeyTyped(java.awt.event.KeyEvent evt){

    String sch = ((JTextField)ComboItemName.getEditor().getEditorComponent()).getText();

    try {
        rset = new JDBC.DB().getData("SELECT * FROM item_reg WHERE id = '"+sch+"'");
    } catch (Exception e) {
        System.out.println(e);
    }
    ComboItemName.removeAllItems();
    try {
        while (rset.next()) {
            String item = rset.getString("id");
            ComboItemName.addItem(item);
        }
    } catch (SQLException ex) {
        System.out.println(ex);
        //Logger.getLogger(dataprocess.class.getName()).log(Level.SEVERE, null, ex);
    }
    System.out.println(sch);
    ComboItemName.setSelectedItem(null);
    ComboItemName.setPopupVisible(true);
    ((JTextField)ComboItemName.getEditor().getEditorComponent()).setText(sch);
}