Java Puzzlers. Traps, Pitfalls, and Corner Cases. Joshua Bloch. Neal Gafter. Upper Saddle River, NJ • Boston • Indianapolis • San Francisco. New York • Toronto. This sampler contains one puzzle from each chapter of Java Puzzlers by working knowledge of Java can understand these puzzles, but many of them are. This lively book reveals oddities of the Java programming language through entertaining and thought-provoking programming puzzles." Disqus - Java Puzzlers Ebook Pdf Free Download. Formats and Editions of Java puzzlers traps, pitfalls, and corner cases [].

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Java Puzzlers - Traps, Pitfalls and Corner Cases. Home · Java Java Pitfalls: Time-Saving Solutions and Workarounds to Improve Programs. Read more. Effective Java & Java Puzzlers ii. It's your turn. ▫ Solve some puzzles at your own iii. Solve'em together. ▫ Provide solutions and background. puzzlers. •Java Puzzlers has been a joint effort led by Joshua Bloch, with help from Neal Gafter, myself, Bob Lee and others. •We've scraped the bottle of the.

But don't do that! It would be cheating, and it would take all of the fun out of the book. Instead, run your own programs through FindBugs. You'll be surprised at what it finds. It found several bugs in my programs -- including the JDK itself.

Do most Java technology developers make the mistakes you identify in the puzzlers? Did you have to make these mistakes yourself first before you could identify them?

It's a near certainty that every Java developer will get caught by some of these problems at one time or another. Neal and I have definitely fallen into some of these traps.

Now that I'm attuned to them, I see them all the time in code that I review, even in code examples slated for publication. Although a few of the puzzles may seem contrived, almost all of the puzzlers arose from real programmers struggling with real problems. As Neal pointed out, the richest source of puzzler material was JDK bug reports that were closed as "not a bug.

I noticed in the errata that the book contains one real error. Would you care to comment on it? Ah, yes It turns out that even we are not immune from falling into these traps. In the solution to Puzzle 65 "A Strange Saga of a Suspicious Sort" , we suggest a replacement for a faulty method in the puzzle.

Unfortunately, our suggested replacement is also broken. We fell right into the trap described in Puzzle 32 "Curse of Looper". A colleague of ours, Yoshiki Shibata, discovered this while translating the book into Japanese. Unfortunately, the book had already been printed by the time Yoshiki discovered the problem, but we'll correct it in the second printing. If you're curious about the details, you can take a look at the errata page , but don't look until you've done Puzzles 65 and In one sense it's embarrassing, but in another, it validates the whole project.

The traps and pitfalls described in Java Puzzlers are real, and no one is immune from them. If you want your programs to be bug-free, it's definitely in your interest to understand these traps and pitfalls. Is there a particular set of assumptions or style of thinking that your puzzlers confront or unearth more than any other? That's a tough one. I guess the style of thinking that most often gets developers into trouble is unwarranted optimism. There's a natural tendency to expect your program to just do the right thing, but the machine can't read your mind.

Most of the facilities provided by the system have certain limitations that you have to be aware of. For example, an int isn't the same thing as an integer: There are infinitely many integers, but only 2 32 int values. That means you have to worry about overflow. For example, you might think that this loop iterates over each int value exactly once:. It doesn't. It's an infinite loop, because every int value is less than or equal to Integer. Once the loop gets to Integer. That's just one simple example of this style of thinking, but it can be applied to every aspect of the language and its libraries with equally unpleasant results.

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Are certain kinds of developers more likely than others to profit from your book? Is it oriented more toward developers of a particular level or a particular kind? Any experienced Java developer could benefit from it. It isn't for raw beginners.


If you're just learning the language, it will only confuse you. But if you read and understood Effective Java , then you're certainly ready for Java Puzzlers. Do you have a favorite puzzler? I love all of my children equally. No, seriously, it's hard to pick just one, and my answer would vary depending on what day you asked me. But today, my favorite is Puzzle 85 "Lazy Initialization" , because its behavior is so shocking. I can't say more without spoiling the puzzle.

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They all did great work under a tight schedule. We thank our management at Google for their support. Our director, Prabha Krishna, was unfailingly encouraging. We thank the many Java programmers who submitted bug reports to Sun over the years, especially those who submitted bug reports that turned out not to describe real bugs.

Such bug reports were perhaps the richest source of puzzler material: If correct behavior misled programmers into thinking that they had discovered a bug, it probably represents a trap or pitfall. In a similar vein, we thank Sun for having the courage and wisdom to put the entire Java bug database on the Web in [Bug].

This action was unheard of at the time; even today it is rare.

Special thanks are due Ron Gabor and Mike "madbot" McCloskey for the sheer magnitude of their contributions. Ron contributed Puzzles 28, 29, 30, and 31 and Mike contributed Puzzles 18, 23, 40, 56, and They found flaws, suggested improvements, offered encouragement, and hurled invective.

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Any flaws that remain are the fault of my coauthor. We thank the queen of the bloggers, Mary Smaragdis, for providing a home for us on her celebrated blog [MaryBlog].

She graciously let us try out the material that became Puzzles 43, 53, 73, 87, and 94 on her readers.

We judged the solutions and Mary gave out the prizes. The discussions on Mary's blog contributed greatly to these puzzles. We thank our many supporters who responded enthusiastically to Java Puzzlers over the years. The JavaOne program committee provided a home for the talks. Yuka Kamiya and Masayoshi Okutsu made the "Java Puzzlers" talks a success in Japan, where they took the form of real game shows with onstage contestants.

Remarkably, the same person won every single contest: The undisputed Java Puzzler champion of Japan is Yasuhiro Endoh. We thank James Gosling and the many fine engineers who created the Java platform and improved it over the years. A book like this makes sense only for a platform that is rock solid; without Java, there could be no "Java Puzzlers. We give special thanks to Doug Lea, who served as a sounding board for many of the ideas in the book.

Once again, Doug was unfailingly generous with his time and knowledge. We thank Professor Akiyoshi Kitaoka of the Department of Psychology at Ritsumeikan University in Kyoto, Japan, for permission to use some of his optical illusions to decorate this work. Professor Kitaoka's illusions are, quite simply, astonishing. Words cannot do them justice, so you owe it to yourself to take a look.

He has two volumes available in Japanese [Kitaoka02, Kitaoka03]. An English translation encompassing both volumes is coming soon [Kitaoka05].

You won't be disappointed. We thank Tom and Ray Magliozzi of Car Talk for providing jokes for us to steal, and we thank their legal counsel of Dewey, Cheetham, and Howe for not suing us. We thank Josh's wife, Cindy, for helping us with FrameMaker, writing the index, helping us edit the book, and designing the decorative stripe at the beginning of each chapter. Last but not least, we thank our families— Cindy, Tim, and Matt Bloch, and Ricki Lee, Sarah, and Hannah Gafter— for encouraging us to write and for putting up with us while we wrote.

Introduction This book is filled with brainteasers about the Java programming language and its core libraries. Anyone with a working knowledge of Java can understand these puzzles, but many of them are tough enough to challenge even the most experienced programmer. Don't feel bad if you can't solve them.

They are grouped loosely according to the features they use, but don't assume that the trick to a puzzle is related to its chapter heading; we reserve the right to mislead you. Most of the puzzles exploit counterintuitive or obscure behaviors that can lead to bugs. These behaviors are known as traps, pitfalls, and corner cases.

Every platform has them, but Java has far fewer than other platforms of comparable power. The goal of the book is to entertain you with puzzles while teaching you to avoid the underlying traps and pitfalls. By working through the puzzles, you will become less likely to fall prey to these dangers in your code and more likely to spot them in code that you are reviewing or revising.

This book is meant to be read with a computer at your side. It should support release 5. You can download the source code for the puzzles from. Unless you're a glutton for punishment, we recommend that you do this before solving the puzzles.

It's a heck of a lot easier than typing them in yourself. Most of the puzzles take the form of a short program that appears to do one thing but actually does something else. It's your job to figure out what the program does. To get the most out of these puzzles, we recommend that you take this approach: 1. Study the program and try to predict its behavior without using a computer.

If you don't see a trick, keep looking. Once you think you know what the program does, run it. Did it do what you thought it would? If not, can you come up with an explanation for the behavior you observed?

Java™ Puzzlers: Traps, Pitfalls, and Corner Cases

Think about how you might fix the program, assuming it is broken. Then and only then, read the solution. Some of the puzzles require you to write a small amount of code. To get the most out of these puzzles, we recommend that you try— at least briefly— to solve them without using a computer, and then test your solution on a computer.VW Cadddy Maxi signaling as a extraordinary download java for a bit.

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