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The upcast technique is the preferred approach when applicable. The checks it requires are simpler than those of the previous technique; it is substantially more efficient than using BigInteger. Unfornately Unfortunately it cannot be applied to operations involving the biggest type long, as there is no bigger type to upcast to.
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NUM16-EX0: Depending on circumstances, integer overflow could be benign. For instanceexample, many algorithms for computing hashcodes hash codes use modular arithmetic, intentionally allowing overflow to occur. Any computation where overflow is expected and allowed must explicitly document this fact.
Risk Assessment
Failure to perform appropriate range checking can lead to integer overflows, which can cause unexpected program control flow or unanticipated program behavior.
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="bd8350c787174798-7f40aa2f-493d43ff-83cb9589-0f2b236d1c5ef9f5f4fd88db"><ac:plain-text-body><![CDATA[ | [[JLS 2005 | AA. Bibliography#JLS 05]] | [§4.2.2, "Integer Operations" | http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.2] | ]]></ac:plain-text-body></ac:structured-macro> |
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