Insert Chinese data in Oracle but cannot be shown when querying

Question

I use:
JDK 1.1.8, Oracle 8i, thin driver.
The OS is HP Unix.
I successfully insert the Chinese Big5 encoding data into Oracle. But I can't show the Chinese again when I querying.
Here's my code:
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection
("jdbc:oracle:thin:@hpdev.wisers.com:1521
:research", "corp", "corp");
stmt = con.createStatement();
String sqlString = new String("insert into filetable values(1,"
+ var1 + "," + var2 + "...)");
stmt.executeQuery(sqlString);
Then I show the result by "select * from filetable;". However, the Chinese Big5 encoding data cannot be shown, "+??.." is shown instead. There is no problem when the data is in English.
I have tried
byte[] sqlStringBytes = sqlString.getBytes("Big5");
String newsql = new String(sqlStringBytes,"Big5");
stmt.executeQuery(newsql);
but still not successful.
My NLS_LANG is
AMERICAN_AMERICA.ZHT16BIG5
How can I make use of this variable? How can I solve the problem?
I am very in hurry. The program deadline is coming!! Help please!!
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Answer 1

Your code looks fine ?
What's your db character set ?
I successfully insert the Chinese Big5 encoding data into Oracle.How do you know this ? Did you verify with SQL*Plus to see whether the data can be retrieved ?
What are var1 and var2 ?