Entering special characters at the command line.

I'm writing a simple program in java that automates certain processes in learning a foreign language.
This includes holding a database of vocabulary within the context of a sentence and testing a student on words they have encountered.
Nothing too tricky, except that I am having trouble with entering special characters at the command line. I'm not really surprised by this and was hoping that someone could help me.
I'm using a mixture of Solaris 8 and Mac OS X 10.3 for running the software, so anyone with any input on either of these systems will be able to help.
The characters I am trying to enter are the following:
�,�,�,�,�,�,�,�,�,�,�,�.
They are latin, and used in Spanish amongst other languages.
I'm a little confused by the implementation of character sets. I can enter these characters in applications such as word or textedit or an email, but just not at an X window.
From looking at the web it appears that these characters can be input using the
Latin1 (ISO 8859-1) character set or the ISO 10646-1/Unicode extension.
I'm just not sure what I actually have to do to get it to work.
If anyone can offer any help I'd be really grateful.
Ian Stanton

It's a problem that could be encountered in different circumstances, in this circumstance it is with a program I am writing in java.
I anticipate that these days not that many applications are delivered that require use of the command line, but since I am still learning Java it is necessary to explore this avenue.
It's interesting actually since presumably developers writing code for the international market need to accomodate characters similar to those I am attempting to enter, and more that are less familiar to me such as far and middle eastern scripts, and of course many others.
We (possibly) assume that since a character is printed on our keyboard it is a simple matter to read it in. But what if I was a Spanish student wanting to type a character into the command line and that character wasn't there? I believe that Spanish (and variants of that language) is the third most spoken language on the planet.
These characters are often relatively easy to enter in office and internet applications amongst others but apparetly not so at the command line.
Maybe this question is more suitably asked of the Unix community but I thought it a good idea to try Java since i was writing Java code and that many Java programmers could have encountered the same problem.

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