Runoob Java 教程数据库知识结合在线编译器如何实时运行代码？

import java.sql.*;

public class DatabaseDemo {
    public static void main(String[] args) {
        // 数据库连接参数
        String url = "jdbc:mysql://localhost:3306/runoob";
        String user = "root";
        String password = "your_password";

        // 注册驱动
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            return;
        }

        // 建立连接
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            conn = DriverManager.getConnection(url, user, password);
            stmt = conn.createStatement();
            String sql = "SELECT id, name, url FROM websites";
            rs = stmt.executeQuery(sql);

            // 处理结果集
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String urlWeb = rs.getString("url");
                System.out.println("id: " + id + ", name: " + name + ", url: " + urlWeb);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}