In the tradition of Effective Java”, Bloch and Gafter dive deep into the subtleties of the Java programming language and its core libraries. Illustrated with visually. Java Puzzlers. Traps, Pitfalls, and Corner Cases. Joshua Bloch. Neal Gafter. Upper Saddle River, NJ • Boston • Indianapolis • San Francisco. New York • Toronto. Java Puzzlers, a new book by Joshua Bloch, Google’s chief Java architect, and Neal Gafter, Google software engineer and Java technology evangelist, contains .

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Me”replace all occurrences of the string “. For example, you could use a string buffer: If you happen to write a program that really can assign to a blank final more than once, the compiler will helpfully point this out to you.

Published on August 9, Perhaps surprisingly, it does not print but 0. Therefore, the java puzzlers joshua bloch method attempts to access the third java puzzlers joshua bloch of its array argument even if it has fewer than three elements.

Error (Forbidden)

The joshuq method returns true. Don’t think twice — buy it now: In case you are curious, here is what the program looks like after the Unicode escapes are translated to the characters they represent: This appendix explains the nature of each illusion and identifies the inventor, if known. If you think of java puzzlers joshua bloch values as apples and int values as oranges, the program is comparing apples to oranges.

The easiest way to fix the program is to remove java puzzlers joshua bloch Unicode escape from the comment, but a better way is to initialize c with an escape sequence instead of a hex integer literal, obviating the need for the java puzzlers joshua bloch Learn more about Amazon Giveaway.

Getting started with Java programming language: Then the main method executes, causing the program to print User ID: There is no shift distance that discards all 32 bits of an int value or all 64 bits of a long value.

To quote from the documentation for this method [Java-API]: The first print statement evaluates the conditional expression true? Again, we highlight the entire comment in boldface: Narrowing primitive conversions java puzzlers joshua bloch lose information about the magnitude or precision of numeric values [JLS 5.

Most of the puzzles take the form of a short program whose behavior isn’t what it seems. Avoid mixed-type comparisons, because they are inherently confusing Puzzle 5.

I can guarantee you have written at least one of these issues into your code. Jun 05, Owen Lindsell rated it liked it. Also, regular expressions are tricky: The Last Laugh What does the following program print?

Although useful it is a bit ungainly and can lead to some confusion itself. Whenever you use an integral type, be aware of the boundary conditions.

Java Puzzlers

These recursive invocations cause a StackOverflowError before the java puzzlers joshua bloch body ever gets a chance to execute. Think about how you might fix the program, assuming it is broken. Our attempt to comment out a section of the program failed because string literals java puzzlers joshua bloch not treated specially within comments.

Then these byte values are translated into char values by the String constructor. To get a valid filename for the platform on which you are running, you should use the correct platform-dependent separator character in place of the slash.

In summary, operator overloading can be very misleading. These are called abrupt completions because they prevent the program from executing the next statement in sequence.

Java™ Puzzlers: Traps, Pitfalls, and Corner Cases

Great collection of tricks, most of which are valid for the languages other than Java too. Field and Stream This program seems to have all the bases covered. The rightmost six bits are the only pizzlers on which java puzzlers joshua bloch, and 2,, differ, so their float representations are identical.

Although the output may look the same to the naked eye, it could easily cause problems if it were saved in a java puzzlers joshua bloch or piped to another program for subsequent processing.

Son of Looper Like the previous puzzle, this one seems java puzzlers joshua bloch at first glance. The remainder of the program appends the characters a, i, and n to the empty string buffer and prints out ppuzzlers contents, which are always ain. Unicode escapes must be well formed, even if they appear in comments. One of them works only in release 5.