Java Puzzlers. Traps, Pitfalls, and Corner Cases. Joshua Bloch. Neal Gafter. Upper Saddle River, NJ • Boston • Indianapolis • San Francisco. New York • Toronto. 1. A Java Puzzlers Sampler. This sampler contains one puzzle from each chapter of Java Puzzlers by Joshua. Bloch and Neal Gafter (Addison Wesley, ). 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 [ilalsmaknersound.ml].
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Java Puzzlers. ▫by Joshua Bloch and. Neal Gafter. ▫95 puzzles on pages. ▫ Covers different topics. ▫ Expressions, Strings, Loops. look at some tricky features of Java, those that can trip you over, and also look at . "Java Puzzlers: Traps, Pitfalls, and Corner Cases,". Joshua Block and Neal Peierls, Joshua Bloch, Joseph Bowbeer, David Holmes,. Doug Lea, Addison. Looking for a pdf version of “Java Puzzlers” by Joshua Bloch and Neal Gafter? In this post, you can find links for Java Puzzlers pdf Download.
None of the programs actually do what you expect them to. If you can't figure out what might be wrong with a program, you run it and find out what it actually does. All the programs can be downloaded from the book's web site.
If you're lucky -- or very smart -- you have an "Aha! Either way, you turn the page, and we explain the whole thing to you. Hopefully, the lesson sinks in, and you never make that incorrect assumption again.
In this way, working through puzzles can "inoculate" you against the traps and pitfalls of the Java platform. Why is the book illustrated with optical illusions?
One day, Neal and I were on the phone with our editor, Greg Doench, trying to figure out what to put on the cover of the book, and Neal had one of those "Aha!
He said, "Do you realize that these puzzles are optical illusions? But when you run them, they do something entirely different.
Java Puzzlers - Traps, Pitfalls and Corner Cases
This is exactly how optical illusions work. They appear to have some property, and the longer you stare at them, the more they appear to have that property. But if you try to confirm it with a ruler -- or mask, for some illusions -- you find that they don't have that property at all.
For example, these letters appear to tilt, with alternating letters tilting in opposite directions:. But if you color the letters yellow, you can see that they aren't tilted at all.
The "candy stripes" inside the letters fool you into thinking the letters are tilted:. How does recognizing that initial appearances can be deceiving help people to become better developers? Vision scientists study optical illusions to gain deep insights into the human visual system. In the same way, studying code illusions yields deep insights into the Java platform.
But there is one key difference: Even if you understand why an optical illusion works, it doesn't stop working. If you understand how a code illusion works, you can stop making that mistake, and you can spot it in code that you're reviewing.
Java Puzzlers: Traps, Pitfalls, and Corner Cases
Has working on the puzzlers helped some developers to confront other programming problems? It caused him to go back to a library that he was working on and change the way a constant was defined. The other day, I stumbled on a web page where the GCJ folks found a bug in their compiler using one of our puzzles Puzzle 45, "Exhausting Workout". And just yesterday, a coworker came to me with a bug that turned out to be the same one in "Reflection Infection" Puzzle You've focused a lot on what you call the "traps, pitfalls, and corner cases" of the Java platform.
What did you learn? The key insight is that nothing is perfect: Even the best programming languages have traps waiting to snare the hapless programmer. But that doesn't mean the situation is hopeless. We came to realize that there are a few key principles underlying many traps and pitfalls.
If you learn these principles and act accordingly, you can avoid whole classes of problems. For example, the puzzles in Chapter 8 "Classier Puzzles" all involve name reuse: If you keep name reuse to a minimum, you avoid many problems. One thing that surprised us was just how many traps and pitfalls are amenable to static analysis.
If you run the puzzles in our book through Bill Pugh and David Hovemeyer's excellent FindBugs tool, it will spot many of the problems. But don't do that! It would be cheating, and it would take all of the fun out of the book.
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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.
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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.
Are certain kinds of developers more likely than others to profit from your book? Java Puzzlers: Traps, Pitfalls, and Corner Cases. Java Puzzlers provided in-depth explanation of traps, corner cases and pitfalls in Java programming. This books will determine your programming skills in Java and the core knowledge of the language.
The best way to use this book is by solving the puzzles given in the book, and then only looking at the solutions provided. The book is divided into 10 chapters all of which are related with puzzlers. So, the book is all about puzzles about Java. Java Puzzlers will be a boon for you if you are looking forward to strengthening your knowledge in the core aspects of Java. A catalog of traps and pitfalls and notes on illusions are provided at the end of the book.
Copyright issues: The pdf version of this book is made available here for download for academic purpose only, i.Rate and Review. The pdf version of this book is made available here for download for academic purpose only, i. So, the book is all about puzzles about Java. The pdf file of the book has been uploaded directly on dropbox to make the download free, instant and easy.
And just yesterday, a coworker came to me with a bug that turned out to be the same one in "Reflection Infection" Puzzle The "candy stripes" inside the letters fool you into thinking the letters are tilted:.
Contact Us US Sales: 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.
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