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That does not define the varible Key. It gives the variable Key a value of 4.
You need a data type before a variable name to define a variable:
<datatype> var_name = ...
where <datatype> is the...

Where is the variable Key defined?

Did the CaesarCipher class compile OK? Where is its .class file?


You need to use variable names here, not the names of the classes.

Does this error message go with the code you posted for the reader class?
Error message source reference: CaesarCipher cipher = new CaesarCipher();
reader class source: CaesarCipher cipher = new...

Please copy and paste here the full text of the error messages.