I’e been programming Java forever, but have been away from it for a while. Can anyone recommend a really good Java reference, where ‘really good’ is defined by ‘Good coverage of the language, detailed coverage of recent extensions, and written for the technical reader (not a ‘for Dummies’ sort of book)’?
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As well as references saying what has changed in the languages (which other answers already cover better than I could) I can’t recommend highly enough the Second edition of Effective Java by Joshua Bloch – which explains the most effective ways of using the language.