That is a very good question "my dear Watson!" Oliver is simply the observing cat that appears on the page where all the publishing information is posted (Approx. page 6 in from the cover.) The only connection that I can find between Oliver and the rest of the book (from the front cover to page 35) is that Elisabeth Freeman (one of the books authors) is a vet and loves animals. Maybe we will learn some cool information about what an observer means in Java as we progress and this little 'Easter Egg' will be explained.
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