Fat-Client-Development – Develop the Base-Class for Business Objects

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Last revision of this document:
2006-08-14

Business Objects are entities that keep together data belonging to one 'business-area'; e.g. an invoice with a 'header' and several 'positions'. Business Objects can contain data that is physically stored on different database-tables.

For the theory about Business Objects please consult Using Business Objects to handle data-storage and retrieval.

In the Base Class (which is developed in this step), variables and methods that are used by all Business Objects are developed.

`Preface:`

In former steps code was written for understanding in favour of performance. As this class is intended to be inhereted by a heap of Business Objects, preference was given to performance if there has to be made a decision between understandability and performance. I hope, that the comments placed in the code will help you to understand what intention is behind the code.

`Credits:`

Too numerous to mention; the idea is available in dozens of versions – I refined a lot of ideas into my system.

Prerequisites:

This step can be done independant from previous steps;
recommended is, to have JS_FC01i - Create and code the class for the 'Task-Frame' to maintain 'Projects' completed - and its prerequisites too.
To get the ideas and the theory of Business Objects it is recommended to browse the following documents:
Using Business Objects to handle data-storage and retrieval and
Business Object, Overview – Advanced Java Fat-Client-Development.

`Create the (base-)class for Business Objects:`

There are some variables that are common to all Business Objects. Those are defined in a base-class.

Right click onto the project 'JS_Base' and select >New>Class
Enter the Package (js_base.bo), the (Class-)Name (JSBS_BO), check that no checkbox is selected; then click the [Finish] button.
Eclipse has already generated a template and the individual code can be entered. Please see the code to be entered at JSBS_BO - or copy it from there ;-) .

top.

`Next Steps:`

It is time to deal with the Business Object specifically designed for this business task: 'Project'. First a General Class for the Business Objecthas to be created. JS_FC01k – Develop the General Class for the Business Object 'Project'.