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Message: [QUOTE="Roedy Green, post: 4233049"] Here is a better example to illustrate my question: catch (IllegalArgumentException|IOException ex) What is the compile-time type of ex? What is the run-time type of ex if you got an IllegalArgumentException? What is the run-time type of ex if you got an IOException ? There may be more grown-up terms for "compile time type" and "run time type", but I think you know what I mean. Or is there a rule that catch (a | b ex ) requires a to be a subclass of b, which would neatly sidestep the problem, but then the feature would not do anything useful. [/QUOTE]