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I have a new question related to charset

I have created two simple applications in Java. the first is a Chat Server, the second application is the Chat Client for the server.

I have created the executable files for the two applications (Server and client) and its work well as "console applications" (for now I use the Scanner.in object) but when the Strings have special chars (for example à, è, ù, ecc.) the client or the server receive the question mark (?). In which mode I can solve?

If I use directly the jar library I don't have problems.

Kind regards,

Enrico