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我正在尝试使用 ResultSet （UCanAccess 支持）在 GUI 中填充组合框

package Vegan;

import java.sql.Connection;
import java.sql.DriverManager;


public class connectionString {

static Connection connection = null;

public static Connection getConnection()
{
    try
    {
        connection = DriverManager.getConnection("jdbc:ucanaccess://C:/Mo//MyDatabase1.accdb");
        System.out.println("---connection succesful---");
    }

    catch (Exception ex)
    {
        System.out.println("Connection Unsuccesful");
    }

    return connection;
}

package Vegan;

import static java.nio.file.Files.list;
import static java.rmi.Naming.list;
import java.sql.*;
import java.util.ArrayList;
import static java.util.Collections.list;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JComboBox;


public class DB {


private static ResultSet rs = null;
private static PreparedStatement …