JDBC and SQL

Create an Author class and populate that for each author. So it has an Id, Firstname, Lastname.
Hold an array of authors.

Code:

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Author[] authors = {new Author(1, "firstname", "lastname"), new Author(1, "firstname", "lastname")};

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Actually, how are you getting the authors? I'm assuming there (based on your example) it's a hardcoded array, but if it's actually from a file then I'd suggest filling a List<Author> while reading the rows.