Other useful constructors, methods, and constants are prede ned in the classes in Java

Generation QR Code in Java Other useful constructors, methods, and constants are prede ned in the classes
Other useful constructors, methods, and constants are prede ned in the classes
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Float, Double, and Math
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The additive operators + and - ( 15182)
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The numerical comparison operators <, <=, >, and >= ( 15201) The numerical equality operators == and != ( 15211)
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The unary plus and minus operators + and - ( 15153, 15154) The multiplicative operators *, /, and % ( 1517)
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The increment operator ++, both pre x ( 15151) and post x ( 15142) The decrement operator --, both pre x ( 15152) and post x ( 15143)
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Positive zero and negative zero compare equal; thus the result of the expression 00==-00 is true and the result of 00>-00 is false But other operations can distinguish positive and negative zero; for example, 10/00 has the value positive in nity, while the value of 10/-00 is negative in nity NaN is unordered, so the numerical comparison operators <, <=, >, and >= return false if either or both operands are NaN ( 15201) The equality operator == returns false if either operand is NaN, and the inequality operator != returns true if either operand is NaN ( 15211) In particular, x!=x is true if and only if x is NaN, and (x<y) == !(x>=y) will be false if x or y is NaN Any value of a oating-point type may be cast to or from any numeric type There are no casts between oating-point types and the type boolean
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TYPES, VALUES, AND VARIABLES
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Floating-Point Operations
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If at least one of the operands to a binary operator is of oating-point type, then the operation is a oating-point operation, even if the other is integral If at least one of the operands to a numerical operator is of type double, then the operation is carried out using 64-bit oating-point arithmetic, and the result of the numerical operator is a value of type double (If the other operand is not a double, it is rst widened to type double by numeric promotion ( 56)) Otherwise, the operation is carried out using 32-bit oating-point arithmetic, and the result of the numerical operator is a value of type float If the other operand is not a float, it is rst widened to type float by numeric promotion Operators on oating-point numbers behave as speci ed by IEEE 754 (with the exception of the remainder operator ( 15173)) In particular, the Java programming language requires support of IEEE 754 denormalized oating-point numbers and gradual under ow, which make it easier to prove desirable properties of particular numerical algorithms Floating-point operations do not ush to zero if the calculated result is a denormalized number The Java programming language requires that oating-point arithmetic behave as if every oating-point operator rounded its oating-point result to the result precision Inexact results must be rounded to the representable value nearest to the in nitely precise result; if the two nearest representable values are equally near, the one with its least signi cant bit zero is chosen This is the IEEE 754 standard s default rounding mode known as round to nearest The language uses round toward zero when converting a oating value to an integer ( 513), which acts, in this case, as though the number were truncated, discarding the mantissa bits Rounding toward zero chooses at its result the format s value closest to and no greater in magnitude than the in nitely precise result Floating-point operators can throw a NullPointerException if unboxing conversion ( 518) of a null reference is required Other than that, the only oating-point operators that can throw an exception ( 11) are the increment and decrement operators ++( 15151, 15152) and --( 15143, 15142), which can throw an OutOfMemoryError if boxing conversion ( 517) is required and there is not suf cient memory available to perform the conversion An operation that over ows produces a signed in nity, an operation that under ows produces a denormalized value or a signed zero, and an operation that has no mathematically de nite result produces NaN All numeric operations with NaN as an operand produce NaN as a result As has already been described, NaN is unordered, so a numeric comparison operation involving one or two NaNs returns false and any != comparison involving NaN returns true, including x!=x when x is NaN The example program:
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class Test {
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