如何将sql数据库中列的总和显示到Java应用程序中？

import java.sql.*;

public class DatabaseSumExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/database_name";
        String username = "your_username";
        String password = "your_password";
        
        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            String sql = "SELECT SUM(column_name) FROM table_name";
            try (Statement statement = connection.createStatement();
                 ResultSet resultSet = statement.executeQuery(sql)) {
                if (resultSet.next()) {
                    int sum = resultSet.getInt(1);
                    System.out.println("Sum: " + sum);
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}