How can I represent in Java special characters
<p>I'm a beginner in Java programming language, and I have a problem that I don't know how to solve. I need to represent special characters like "Ψ", "∑", "Θ", "Ξ", ",", "ß".
how can I do it? </p>

<p>Update: Thanks for the answers, sorry for not detail a little bit more the question, so here i go. 
I'm trying make 7Bit alphabet, this is for encoding PDU for sent "SMS". 
<a href="http://pastebin.com/NtY1aWTR" rel="nofollow">http://pastebin.com/NtY1aWTR</a>   Here the class in java. </p>

<p>If the user enter character the method handle the value in 7Bits from the HashMap. 
For example : 
If the user enter " <strong>Votaguz</strong> " 
The result is:  1010110 1101111 1110100 1100001 1100111 1110101 1111010
But when the user try write something how : " <strong>Θ</strong> "  [OMEGA] 
 The Answer is:   null null</p>
