for Marlene Miller on next step toward scjd

[Abhi Chat]

Hi,

u had suggested steps to go aheadfor Jtable and database...could u suggest somethin for other APIs like threads, guis...

The steps u suggested were lot of help...

they were:

Step 1. Read and write records to a RandomAccessFile.

All records have the same length. A record has 3 fields. The first field is an integer (4 bytes, binary data). The second field is ASCII text padded with spaces. The third field is ASCII digits padded with spaces.

Step 2. Create a GUI with a JTable and a TableModel (and a menu and some buttons, if you want). Read the records from the RandomAccessFile and display them in the JTable. Change the values in the JTable and update the record in the file.

Step 3. Add a search button and two text fields above the JTable. Enter data into the text fields. Push the search button. Search the RandomAccessFile for all records matching the specified data. Move the data from the records to the TableModel to the JTable.

Step 4. Add a book button to the JTable. Select a row in the JTable. Change some data in the row. Push the book button. Replace the record in the file with the changed row.

Step 5. Run two programs, a client and a server. The RandomAccessFile goes on the server. Write a server program to read and find records. Use RMI to access the file from the client.

Also i was bit unclear with the 5th step...the file is in server...the read and find methods are also on the server...ill use RMI to activate those commands and get the result....If you could correct my understandin..thanx

Abhi

[Marlene Miller]

Hi Abhi.

I am happy to know my suggestions were helpful. Thank you. I don�t know what else to suggest, because that is about all I know.

Let me try to explain my suggestion 5. On the SCJD, you have a choice between using sockets or RMI. This example is to get a little practice using RMI.

Write two (small) programs, the client program and the server program. The server program reads the database file. The client program displays the data in a JTable. Some people put the �business logic� in the client program, other people put it in the server program. I am not saying where to put it.

The GUI has a search button, a JTable and a book button. The business logic has a search function and a book function. The database access has find, read and update methods.

Now use RMI so that the client program can access the database. Some method(s) in the client have to call a method(s) in the server program. It depends on where your business logic is, whether that method is a business search() or a database find(). Define a remote interface (either business methods or database access methods). The server implements the interface. The client uses the interface to access the remote object.

I wish I could suggest some thread warm-ups. Maybe after you do step 5, you can think about what would happen if two clients try to access the database.

Step 6. Download the assignment. (I haven�t gotten to step 6 yet. )

Good luck Abhi.
Marlene
[ October 20, 2004: Message edited by: Marlene Miller ]

[Abhi Chat]

Hi Marlene,

Thanx for the explanantion...ill get this thing started...even i havent got to step 6 so as things go on ...we can keep ourseleves updated...

abhi

[jiju ka]

Marlene and Abhi,
Until I got the assignment downloaded I wasn't focussed. Now the problem is more clear and every effort can be taken to solve it.

Per my understanding assignment don't have an expiration date. So once you download you can go on thinking over it forever. That is fun.

If you purchase the voucher for exam there is a one year deadline. So just purchase the assignment alone.

Jiju

[Marlene Miller]

Thank you for the advice and your concern, Jiju. Marlene

[Anton Golovin]

Originally posted by jiju ka:
Marlene and Abhi,
Per my understanding assignment don't have an expiration date. So once you download you can go on thinking over it forever. That is fun.

Jiju, it is not fun
[ October 20, 2004: Message edited by: Anton Golovin ]