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Message: [QUOTE="Thomas, post: 2979137"] 1)Hello I noticed that java needs a separated file for each file. Isn't it too much ? I writing a simple project and have to use too many of them I suppose. Is there any way to reduce it, for example putting the code of several classes into one file ? 2) I have two interfaces : ============================================================== public interface Value { double evaluate () throws IllegalStateException; } ============================================================= public interface Arguments extends Value { int arity (); int missingArguments (); void addArguments (double) throws IllegalStateException; } ================================================================= I get identifier expected at the last line it the second class, Whats wrong ? [/QUOTE]