How we connect to a database in JDBC?

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;
public class DBConnection {

public static void main(String[] args) {

String dbURL = "jdbc:mysql://localhost:3306/demo";

String user = "root";

String password = "";

Connection con = null;

try {

con = DriverManager.getConnection(dbURL, user, password);

if (con != null) {

System.out.println("Database Connected.");

}

} catch (SQLException ex) {

System.out.println("Error! User OR password is invalid..");

ex.printStackTrace();

} finally {

if (con != null) {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

}

}

}

}