private static Connection connection = null;


public static Connection getConnection()


{
    try{
        if(connection == null){
            Class.forName("com.mysql.jdbc.Driver");
            Connection con=DriverManager.getConnection(
            "jdbc:mysql://localhost/demo","root","");
            connection = con;
        }

    }catch(Exception e)
    {
        System.out.println(e);
    }
    return connection;
}