Boxing Conversion in Java

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Boxing Conversion
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517 Boxing Conversion Boxing conversion converts values of primitive type to corresponding values of reference type Speci cally, the following 8 conversion are called the boxing conversions: From type boolean to type Boolean From type byte to type Byte From type char to type Character From type short to type Short From type int to type Integer From type long to type Long From type float to type Float From type double to type Double
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At run time, boxing conversion proceeds as follows:
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If p is a value of type boolean, then boxing conversion converts p into a reference r of class and type Boolean, such that rbooleanValue() == p If p is a value of type byte, then boxing conversion converts p into a reference r of class and type Byte, such that rbyteValue() == p If p is a value of type char, then boxing conversion converts p into a reference r of class and type Character, such that rcharValue() == p If p is a value of type short, then boxing conversion converts p into a reference r of class and type Short, such that rshortValue() == p If p is a value of type int, then boxing conversion converts p into a reference r of class and type Integer, such that rintValue() == p If p is a value of type long, then boxing conversion converts p into a reference r of class and type Long, such that rlongValue() == p If p is a value of type float then:
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If p is a value of type double, then 86
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If p is not NaN, then boxing conversion converts p into a reference r of class and type Float, such that rfloatValue() evaluates to p Otherwise, boxing conversion converts p into a reference r of class and type Float such that risNaN() evaluates to true
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If p is not NaN, boxing conversion converts p into a reference r of class and type Double, such that rdoubleValue() evaluates to p Otherwise, boxing conversion converts p into a reference r of class and type Double such that risNaN() evaluates to true
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If p is a value of any other type, boxing conversion is equivalent to an identity conversion (511)
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DISCUSSION
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For other values, this formulation disallows any assumptions about the identity of the boxed values on the programmer's part This would allow (but not require) sharing of some or all of these references This ensures that in most common cases, the behavior will be the desired one, without imposing an undue performance penalty, especially on small devices Less memory-limited implementations might, for example, cache all characters and shorts, as well as integers and longs in the range of -32K - +32K
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A boxing conversion may result in an OutOfMemoryError if a new instance of one of the wrapper classes (Boolean, Byte, Character, Short, Integer, Long, Float, or Double) needs to be allocated and insuf cient storage is available
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Ideally, boxing a given primitive value p, would always yield an identical reference In practice, this may not be feasible using existing implementation techniques The rules above are a pragmatic compromise The nal clause above requires that certain common values always be boxed into indistinguishable objects The implementation may cache these, lazily or eagerly
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If the value p being boxed is true, false, a byte, a char in the range \u0000 to \u007f, or an int or short number between -128 and 127, then let r1 and r2 be the results of any two boxing conversions of p It is always the case that r1 ==
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Unboxing Conversion
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518 Unboxing Conversion Unboxing conversion converts values of reference type to corresponding values of primitive type Speci cally, the following 8 conversion are called the unboxing conversions: From type Boolean to type boolean From type Byte to type byte From type Character to type char From type Short to type short From type Integer to type int From type Long to type long From type Float to type float From type Double to type double
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At run time, unboxing conversion proceeds as follows:
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rbooleanValue() rbyteValue()
If r is a reference of type Boolean, then unboxing conversion converts r into If r is a reference of type Byte, then unboxing conversion converts r into If r is a reference of type Character, then unboxing conversion converts r into rcharValue() If r is a reference of type Short, then unboxing conversion converts r into
rshortValue() rintValue()