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Easy Learn Java: Programming Articles, Examples and Tips - Page 15


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Question: I just started to work in big company... Before I worked with software

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Question: I just started to work in big company... Before I worked with software design myself and developed small programs. Now I hear such terms like "businnes layer", "presentation layer"...
Has it something to do with Java? Please clarify.

Answer: It has more to do with applications structure and used for design of large software products. It helps to divide application logic into big logically independant blocks (layers) that interacts by interfaces. It lets to develop big software products without knowledge of all details...

I will describe here three layers model:
1. Presentation layer - responsible for content dispalying to user and provides interface for user - application interaction. It is client in client - server application.
2. Businnes layer - main logic of an apllication is implemented here: all required calculations, data validations and so on.
Usually runs on server side in client - server application.
3. Data layer - responsible for data management. This layer provides businness layer with all data that are processed there and then presented to user by presentation layer.
Layering of an application lets to change different parts without significant efforts. For example if data layer operates with a SQL database it can be switched to Oracle database.
Well planned and structured application will let do it easy.
--
anatoly
***************************************
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1583 bytes more | 11 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Friday, January 31, 2003 (00:00:00) (4236 reads)

Question: I am trying to construct my GUI so that my images can act like JButton

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Question: I am trying to construct my GUI so that my images can act like JButtons. Can I do this?

Answer: You could try JButton.setIcon()... An iconimage can be created with something like:

Icon myicon = new ImageIcon(mybufferedimage);
JButton mybutton = new JButton(myicon);

then add your button to the appropriate container...


82 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Thursday, January 30, 2003 (00:00:00) (3847 reads)

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