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Autoboxing automatically wraps a value of a primitive type with the corresponding wrapper object. The [§5§5.1.7, "Boxing Conversion,"|http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.1.7] of the _Java Language Specification_ \[[JLS 2005|AA. Bibliography#JLS 05]\] explains which primitive values are memoized during autoboxing: |
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Less memory-limited implementations could, for example, cache all characters and shorts, as well as integers and longs in the range of -32K — — +32K.
Code that depends on implementation-defined behavior is not portable.
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Boolean b1 = true; // Or Boolean.True Boolean b2 = true; // Or Boolean.True b1 == b2; // always equal |
Exceptions
EXP03-EX0EX1 In the unusual case where a program is guaranteed to execute only on a single implementation, it is permissible to depend upon implementation-specific ranges of memoized vulnerabilities.
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Detection of all uses of the reference equality operators on boxed primitive objects is straightforward. Determining the correctness of such uses is infeasible in the general case.
Bibliography
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EXP02-J. Use the two-argument Arrays.equals() method to compare the contents of arrays 02. Expressions (EXP) EXP04-J. Do not perform assignments in conditional statements