How does  java support arabic database?(please help me)

Dear programmers,
i am facing a problem in retriving arabic data base by usying java program.
because whenever i retrive arabic data base it shows me the information as qoustion mark like this ???????????????/
which means that java can not underastand arabic data base.
so please let me know how can i solve this problem by usying java.
thanks for your cooperation.
sincerely smart.

I use sql server as data base for my java program .
the problem is :
When i try to connect my java program with data base has arabic data ,
the java program can't understand the arabic data ,so it replaces the arabic data with question marks like this ?????
Also when i try to write arabic data from my java program to my data base , i find the records in the data base is filled as ????? also.
so , i hope that the question becmes clear ........
i will wait for answer ...

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