Title: It does NOT teach you Java at all, even in 21 years !!!!
Product review: The title really fools you to believe that you can learn Java in 21 days. But the fact is you won't learn Java in 21 YEARS, using this book. If you already know Java, may be this book is good for a reference....brushing up on what you know. But, if you don't know the language at all and you thought you wanted to learn it in 21 days (at least that's what the Title fools you into believing), then you will definitely be sorry. It is like someone asking you to put a puzzle together, without giving you a picture of what you need to put together. The sample codes, most of them, are very ambiguous. Actually I was going to give it zero stars...unfortunately there was no option for it.
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