所以，这个程序有价值 car_number 从数据库 "getReprt" method ，并将按钮的名称作为db中的值。另外，我接下来需要得到这个值，到action listener btn_listener 每个按钮都有自己的值。但在这段代码中，我只得到最后一个数据值，每个按钮都是一样的。我怎样才能给每个actionlistener情境赋予不同的价值观？我做错什么了？

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;

public class Car2q {
    private Connection con;
    private ResultSet rs;
    static JTextArea textArea = new JTextArea();
    static login frame = new login();
    static JScrollPane scrollPane = new JScrollPane();
    static JSplitPane splitPane = new JSplitPane();
    static JPanel panel_left = new JPanel();
    static JPanel panel_right = new JPanel();

    static class login extends JFrame {

        public static void main(String[] args) throws Exception {
            final Car2q c2q = new Car2q();
            c2q.getReport();

            frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
            frame.pack();
            frame.setVisible(true);
            frame.setSize(550, 300);
            frame.setVisible(true);
            frame.add(splitPane);
            splitPane.setSize(550, 300);
            splitPane.setLeftComponent(scrollPane);
            splitPane.setLeftComponent(panel_left);
            splitPane.setRightComponent(panel_right);
            panel_left.setLayout(new GridLayout(0, 1, 5, 5));
            panel_right.setLayout(new GridLayout(0, 2, 5, 5));
        }
    }

    public Car2q() {
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            con = DriverManager.getConnection("");
            con.createStatement();
        }
        catch (Exception e) {
            System.out.println("Error: " + e);
        }
    }

    public String getReport() {
        String car_number = null;
        String report = null;
        List car_number_list = new ArrayList<>();
        try {
            PreparedStatement st = null;
            String query2 = "select * FROM car_register";
            st = con.prepareStatement(query2);
            rs = st.executeQuery();
            while (rs.next()) {
                car_number = rs.getString("car_number");
                String gotit = rs.getString("car_number");
                JButton btn = new JButton(gotit);
                btn.setSize(100, 100);
                panel_left.add(btn);
                ActionListener actionListener = new btn_listener();
                btn.addActionListener(actionListener);
            }
        }
        catch (SQLException e) {
            e.printStackTrace();
        }
        return car_number;
    }

    public class btn_listener implements ActionListener {
        public void actionPerformed(ActionEvent arg0) {
            Car2q c2q = new Car2q();
            String car = c2q.getReport();
            System.out.println(car);
        }
    }
}