Java组合框不从SQL填充

Question

在我的程序中，我有一个ComboBox，用户可以在其中选择他想要编辑的用户，目前我用来填充ComboBox的类没有这样做。我在网站上看到了一些类似的问题，但没看到我做错了什么。如果有人可以解决问题，我们将不胜感激。我对大部分内容还很陌生。

import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.swing.JComboBox;
import javax.swing.JFrame;

public class AdminPanelDelUser {


private String Host = "Hidden";
private String Name = "Hidden";
private String Pass = "Hidden";

private JComboBox<String> userPicker;
private JFrame frame;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                AdminPanelDelUser window = new AdminPanelDelUser();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public AdminPanelDelUser() {
    initialize();
    getUserPicker();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 300, 352);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    JComboBox<String> userPicker = new JComboBox<String>();
    userPicker.setBounds(59, 6, 235, 27);
    frame.getContentPane().add(userPicker);
}

public JComboBox<String> getUserPicker() {
    try {
        Connection conn = DriverManager.getConnection( Host, Name, Pass );  
        PreparedStatement pst = conn.prepareStatement("SELECT * From `table_1`");
        ResultSet rs = pst.executeQuery();
        while(rs.next()) {
            String name =rs.getString("user_name");
            userPicker.addItem(name);
        }
    } 
    catch (Exception e) {
        //Place Pop Warning Later
    }
    return userPicker;
}
}

关于如何进一步改进代码的任何建议都会很愉快。感谢帮助我解决这个问题的任何人。