Como funciona?

import java.sql.*;
import java.io.*;

public class DB
{
	public static void main(String arg[]) throws SQLException, IOException
	{
		
		//carrega o driver jdbc odbc
		try
		{
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
		}
		catch (ClassNotFoundException cnf)
		{
			System.err.println(cnf);
			return;
		}
		
		//conecta ao banco de dados
		try
		{
			Connection conn = DriverManager.getConnection("jdbc:mysql://freesql.org/luizfar","meu_usuario", "minha_senha");
			Statement stmt = conn.createStatement();
			stmt.close();
			conn.close();
		}
		catch (SQLException e)
		{
			System.out.println(e);
		}
	}
}