24 Jun “Every programming language has its quirks. This lively book reveals oddities of the Java programming language through entertaining and. User Review – Flag as inappropriate. A must read books for all java developers. Its clears all the dust from the air making your concepts more clear. User Review . “Every programming language has its quirks. This lively book reveals oddities of the Java programming language through entertaining and thought-provoking.

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These would be perfect interview questions for a sadistic HR person. It provides many bibliographic references. Appendix B describes the optical illusions that decorate the book. Shopbop Designer Fashion Brands.

If initialized with constant expressions, both pig and dog would indeed java puzzlers traps pitfalls and corner cases to the same object, but dog is not initialized with a constant expression.

Determining whether a program can perform more than one assignment to a blank final is a hard problem.

Java Puzzlers: Traps, Pitfalls, and Corner Cases

Not so for hexadecimal and octal literals. In other words, Integer. She read the first puzzle. Nine times out of ten, it indicates an error. To prevent this sort of surprise, test that your methods behave properly when passed negative, zero, and positive values for each numerical parameter.

More generally, the array types should probably have overridden toString to return a string representation of the contents of the array. Otherwise, the conversion is performed as if by an invocation of the java puzzlers traps pitfalls and corner cases method of the referenced object with no arguments; but if the result of invoking the toString method is null, then the string “null” is used instead.

Jan 30, Adam Parkin rated it liked it. Is this a legal Java program? Great way to learn the corner cases of the Java language up to Java 5. Binary floating-point is particularly ill-suited to monetary calculations, as it is impossible to represent 0.

You may be aware that compile-time constants of type String are interned [JLS Unfortunately, this one is a bit too true. The int value is too big to fit in a short. Puzzles are grouped loosely according java puzzlers traps pitfalls and corner cases the features they use, and detailed solutions follow each puzzle.


Therefore, the thirdElementIsThree method attempts to access the third element of its array argument even if it has fewer than three elements. It is clear that the program prints true when it is fixed in this fashion: It’s not easy to address real-world problems in such a generic way.

Java Puzzlers: Traps, Pitfalls, and Corner Cases by Joshua Bloch

It looks as though it incorporates the second fix described, but it produces the same ugly output as the original program because it invokes the Object overloading of println instead of the char[] overloading: It may be worth considering java puzzlers traps pitfalls and corner cases for arithmetic that does not overflow silently. You must initialize such contained anf carefully to avoid a StackOverflowError. In other words, compound assignment expressions automatically cast the result of the computation they perform to the type of the variable on their left-hand side.

For the String type, it performs not addition but tarps concatenation. An unfortunate fact about the compound assignment operators is that they can silently perform narrowing primitive conversions [JLS This lively java puzzlers traps pitfalls and corner cases reveals oddities of the Java programming language through entertaining and thought-provoking programming puzzles. Because all the factors that are multiplied together are int values. Withoutabox Submit to Film Festivals.

Reading the appendix first would take all the fun out of the puzzles.

Java Puzzlers

After all, that is the sum of the hex numbers and cafebabe In this way, you can write any java puzzlers traps pitfalls and corner cases or long value, whether positive or negative, in decimal form, and negative decimal constants are clearly identifiable by the presence of a minus sign. We thank our many supporters who responded enthusiastically to Java Puzzlers over the years.

Now why would it do a thing like that? Multicast This program is confusing any way you slice it. To write a negative decimal constant, you use java puzzlers traps pitfalls and corner cases unary negation operator – in combination with a decimal literal.


Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations have been printed with initial capital letters or in all capitals. The puzzle is made even more misleading because the variable is named i, a name that is usually reserved for integer variables.

Most of the puzzles take the form of a short program whose behavior isn’t what it seems. Based on the previous puzzle, you might think that compound assignment operators are less restrictive than the simple assignment operator.

Unicode escapes can be confusing because they are processed so early in the compilation sequence. The casds is easy to fix.

Operator overloading, even to the limited extent that it is pitfals in Java, can be confusing. Spacing can be deceptive, but parentheses never lie.

They are bug-prone, difficult to maintain, and often run more slowly than the straightforward code they replace [EJ Item 37].

This causes concurrent invocations to take turns using the static t field. We judged the solutions and Mary gave out the prizes. Long Division This puzzle is called Long Division because it concerns a program that divides two long values.

The char[] overloading of println prints luzzlers of the characters contained in the array, and the char[] overloadings java puzzlers traps pitfalls and corner cases String. You can cast the int to a byte, after which you will be comparing one byte value to another: This corrected version of the program fixes all three bugs, printing Pain, Gain, and Main with equal likelihood: The results are well defined, even if they are not always what you want them to be.

This accounts for the final result being off by a factor of a thousand.