see:
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Java Language Conversion Assistant
The Microsoft Java Language Conversion Assistant (JLCA) is a tool that automatically converts existing Java-language source code into C# for developers who want to move their existing applications to the Microsoft .NET Framework.
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http://www.microsoft.com/downloads/details.aspx?FamilyID=052d4095-739e-4ef2-a7df-db95e51f8207&displaylang=en