In this video we take a look at the various object orient abstractions that Delphi provides. Starting with a public field, then a public property, then to an interface (with nothing public on the class). This video is about 5 minutes long and you can watch it on YouTube.
This book will make you a faster Delphi developer, it doesn't matter if you are just starting out, or have been using Delphi since version 1, you will find all sorts of tips, tricks and hacks to boost your productivity.