Which library's "hello excel" example is that?
What does "still not appear" mean - did you change something, and expected different output as a result? libraries

rg.apache.poi.hssf.*
arabic letters appear like rubbish letters=E9/D 'DE4'1C) 'D'B*5'/J) 'DEFB-
what i expect is arabic letters(Not latin charachters)
with english letters it appears perfectly.
Note: the arabic letters(sentences) come from Oracle DB and it appears perfectly at
jsp pages.